My guess is they add the average wait time to the travel time. That would match my expectations for a 6 train. They're about 3 mins apart during weekdays. Not s

My guess is they add the average wait time to the travel time. That would match my expectations for a 6 train. They're about 3 mins apart during weekdays. Not sure what that particular train is like at 3am, but I've seen other trains with 20+ minute wait times.