But when are those things ever right? (as far as the time is concerned...)

Google says 292km, 4h12mins. So that means driving an average 69km/h. When it's 100km/h limit on the 401 (if anyone even goes that slow ) and 65mph on the NY side. So Google assuming the average speed is 69km/h is a little crazy.

Driving 115km/h the whole way works out to 2.5 hours.

Wait time at the border, depending on the time, can change that, but it's usually a quick and easy drive...

-mike