Running-when does the speed come?

Run faster. Problem solved.

Quite simply put, a body builder doesn't gain significant muscle from lifting a pencil 1,000 times. He gains it by constantly pushing harder.

It was a good idea for you to start slowly to get your body used to being in constant motion. But now, being able to do 2 hour long jogs, you need to up your intensity. A body beginner body builder will sometimes start with an empty bar to simply get used to the motions and the weight of the bar itself, but eventually has to add weights to it to make progress.

Good job by the way! No small feat you've accomplished!

I am nowhere near an expert on the matter, so I can only tell you what worked for me.
I started out running around at 16 minute mile when I got back into running. After I got to the point where I could actually run a mile without wanting to die, I increased the distance as you have done.
After that, I started a routine where I would run short 2-3 mile runs on Monday's and challenge myself to run a better time than the previous run. It didn't always happen, but over time it became a competition with myself and I didn't like losing. I also got into some 5k's. Running with faster people made me naturally want to keep up.
On Wednesday and Friday's I would save for runs >5 miles. Once the competition with the 2-3 mile runs became a habit it bled over into the longer runs.
Now I run around a 7:50 min a mile pace on short runs and keep about an 8:45 min a mile pace on longer runs. I ran my first half marathon in April and maintained an 8:50 mile pace throughout. It is not setting any land speed records, but it is getting better.
To sum it up, I went from a 16 min/mile to 8:50 in about 1 year. The key for me was to challenge myself on short runs.

Go to the Runner's World website and search for articles on speed work. You need to be doing some higher speed intervals to get your speed up.

I suck at running but I agree push yourself a bit more...

Distance and speed work. There is tons of information out there on incorporating speed work. I am going to start working on speed work after my race on Sunday. I plan to do one day of a long run (weekend) and on the weekdays do a normal run one day and speed work the next.

As someone else said, runners world has a ton of info.

Speaking as someone who is more tortoise than hare....

Tempo runs. Short runs (a mile maybe less) going fast. Do a good warm up and set your sights on a 10 minute mile. The goal not being how many miles, but how quick. At first, you'll be only doing 1 interval, but then you'll up it. Probably keep it to a mile or less for a bit so you don't over do.

Most serious runners work tempo runs into their training schedule.

Take one or 2 runs a week and run them faster. Choose any type, whether its intervals, fartleks, tempo runs, whatever.

Run faster. Problem solved.

Quite simply put, a body builder doesn't gain significant muscle from lifting a pencil 1,000 times. He gains it by constantly pushing harder.

It was a good idea for you to start slowly to get your body used to being in constant motion. But now, being able to do 2 hour long jogs, you need to up your intensity. A body beginner body builder will sometimes start with an empty bar to simply get used to the motions and the weight of the bar itself, but eventually has to add weights to it to make progress.

Good job by the way! No small feat you've accomplished!

I agree. As a runner, I never just "naturally" got faster. I had to push myself. Once I got strong enough to run 3 miles, I started working on my time. Generally, what I did is start adding little bursts where I would run a bit faster. I gradually made those bursts longer and longer. Also, I ran hills a lot. That way, flat running didn't feel as strenuous and I could run faster.

Good luck, and keep up the great work!

I also am not an expert. I have been running for about 5 months now. Started doing one mile in about 15 minutes, and felt like dying! I recently ran a 5K in 34 min and 20 seconds. I also tested myself in running an 8K and did it in 58 minutes. So, I can't run long distances like you but my speed increased. I am not fast but am impressed with my speed and distance increases in 5 months of time. I did it by just increasing my speed by just .1 mph for just 5 minutes of time. Then the next day for 6 minutes of time. Until, I could run my whole run for that speed. Once that was done, I increased it another .1 for 5 minutes and so on. I am still working on it. I would love to run my 5K by next summer in 33 minutes and run my 8K next fall in 55 minutes. Keep working on it and don't give up! You are doing great.

Go to the Runner's World website and search for articles on speed work. You need to be doing some higher speed intervals to get your speed up.

This. Learn about running intervals. You will increase your aerobic capacity and be able to apply that to your distance runs.

I am not sure, but the fitter and stronger I get, the faster I go, I have knocked a whole 9 mins off my original 5km time set a few years ago...that is just by changing the way I run (I am minimalist now and find I run faster and lighter and with less pain). I run with no heel strike and it does increase efficiency and decrease the stress on your legs and feet. But to each their own, we all run very differently.

Speed work (interval training both running and cross training on bicycle and with rowing) and strength work (heavy weight lifting) have also helped my times, although I am not that concerned with beating any records per se, I have noticed a big change in speed this year.

As someone said earlier, up the pace and you will go faster, you have to set the goals to beat in order to beat them!

p.s. running up hills (or a steep incline on the treadmill) helps too, I finally am able to sprint a full 400m up a 10% incline this year (last night in fact)...

Impressive heart rate! I'm coming up on my runniversary as well. (After a 20+ year break).
I started at 1mile at 12min (above 170)
now I do 4-6 miles (at about 170)
and do about 9:30 minute miles outside and 7:45 inside.

For me "speed" (it's all relative at my age!) came when I let my heart rate go back up to 170.
In the gym, I can keep it around 150, but outside it still goes sky high.

On another front: my most recent RESTING heart rate was 55. Down from 85.

edited to add: I feel like I can focus on speed when I run on the track.

I'd say the easiest way to get speed workouts in is to get a mile warm-up in. Then pick a point and push yourself harder to that point (I wouldn't say all out sprint but definitely faster). So say two light poles away, then jog to the next pole and repeat. Another one is to go to a track...Mile warm up then "sprint" the straightaways and jog the curves. Or do a fast lap, slow lap, rinse and repeat. :-) These were workouts I did in High School and really should do again.

Congrats on being able to go for two hours straight! I have never done that myself I agree with everyone else. You don't get naturally faster you have to push yourself to get there. For me, the treadmill was the best way for me to up my speed. I use to run 15/16 minute miles myself and now I do under a 10 minute mile. I simply had to just keep gradually pushing myself. When I felt comfortable at a pace and my breathing felt steady, I would creep up another .5 on the treadmill. I went from 4.0 to 6.5 doing it like this. It took me a while but it really worked. I also did a lot of interval running where I did bursts of sprinting. Basically just challenge yourself to go faster. It will feel tough but you are definitely going to see that little by little you can handle the faster pace. Hope that helped!

Push your heart rate more.
Map your run before hand, know some distance markers - this road to that road is 3/4 miles, etc. Pick the pace you want to hit, and push yourself to cover those know distances in that pace.

i.e. you map out a course that does half mile loops around a park. You decide your goal is 12:00 miles. Aim for 6:00 loops. Even better, note the half way points on said loops and shoot for 3:00 quarter miles. A track works good too, but I have problems getting bored if I'm on a track for more than half a mile.

If you have a GPS watch, you can try and use it's instant pace for the same thing.