How to track this exercise?

I work two jobs, one a sitting job and the other is delivering papers. I started with one route and just acquired another. I'm trying to figure out how to figure how many calories I burn while throwing the routes. I used a Fitbit on my old route and according to it I was walking 5 miles a day 5 days a week, 7 miles a day on the weekends.

The paper cut my old route in half and I had to take a second route to make up for it. Unfortunately I don't have my Fitbit anymore (cat is to blame, long story, don't ask.) The routine I normally do is, if I can use the customer's driveway, I pull up in the drive, get out of the car, walk far enough toward the house so I can get the paper on their porch. If I can't use their drive I walk it to the porch from the curb. So I'm constantly getting in and out of the car and walking.

I spend about 3.5 hours every morning throwing from Mon-Fri, 5 hours Saturday and 7 on Sunday. This isn't counting the time I spend standing up wrapping the papers for delivery.

Any ideas as to how I would measure this? Other than buying a new Fitbit, since I don't want to do that?