I have mine set for 60 minute missions and I find that mine vary from about 45/50 to maybe 60 or 65 minutes or so. I didn't find the length too different for me from Season 1 to 2. I found the zombie hordes to be much faster though! I never had any issues outrunning/outwalking them in Season 1. I got caught 3 times in a row with Season 2 and disabled them, lol.

I run with my dog, and when she needs to stop and go potty, she really needs to stop, and since the hordes of the undead are very inconsiderate of the basics needs and comforts of a dog, I decided it's easier if I just turn them off.

When I read that my brain immediately did this "mental movie" thing : close up of dog on leash sniffing a tree then assuming the position to use the potty. Camera follows the leash up to the owner dressed in running gear, lightly jogging in place while waiting. The camera then pans past the owner and down the sidewalk to a group of about 10 -20 zombies patiently waiting about 15 feet away, some looking around distractedly, one in front checking his watch then shaking his wrist and putting it up to his ear to listen for ticking, one having another beside him check his teeth for bits of "food" stuck, etc.
Finally the dog is walking away doing the bad attempt at covering up evidence that dogs do and the dog and owner take off again. The zombie group stays put until one happens to look and notice their meal is leaving, taps the zom next to him on the shoulder and points, and then they gradually start shambling after the runner.

I hope that was understandable.