How long is the bus ride from Niagara Falls back to NY?

Generally speaking it's a late afternoon or early evening arrival back into NY from Niagara Falls. Depending on traffic, departure time from Niagara Falls, number of potty breaks, length of stop(s) to eat, timeliness of group, and ease/difficulty of entry into USA from Canada (border-crossing) anywhere from 8 to 10 hours.