Time on site starts when a driver arrives (checks in) at a destination on a route, and ends when they leave (checks out) to continue to the next destination. This can include finding parking, gaining access to the building, security passes, elevators, onsite activities like payment, assembly, unpacking and so on, then exiting, and returning to the vehicle ready to leave.
Bringg uses the time between check-in and checkout to estimate the time of arrival (ETA) at the following destinations in a route.