Gap reports are daily, I don't know of a cumulative gap report, either way gap reports are IMO one of the best tools we have, some managers love them, some hate them.
If you can justify a gap,(sometimes the gap time just doesn't add up with the actual time it takes to get to the next stop) then the manager will go on their way, if you have a 10minute gap going from 101main to 103main, then the manager can chat with ya, until you explain that 103 is on the other side of divided 4 lane main street, deliveries to alley only.