Use the calculator from my Scan Time thread. The one in this thread doesn't include scan timeI would like to figure out how much I will gain on just yearly volume.
Letters and flats count seems about right. But parcels this route got f'd . I'd say even on a summer day we average 15 parcels more per day then we counted for. Christmas 3 month overtime (no misprint) it is probably closer to 30 or 40 parcels for free. Let's go with 15 parcels more on average and say 3 of the bastards dont fit in the box. How much gain would that be?
Here is the program with your numbers (12 mail box parcels and 3 door parcels) and the results:
... Your previous TOTAL parcel time was 72.00 minutes per week ... Your TOTAL new parcel time is 80.14 minutes per week
Under RRECS it is more complicated. It depends on how far you drive and walk to get to the customer's door. I used some reasonable numbers for driveway length and walk distance, but it depends on your route. If you are consistently driving 1/2 mile to a customers house and/or walking 1000ft to their door, expect to gain more time.