Approximately 1.5 hours
Niagara falls is in NY.
Google Maps estimates the driving time as 1 hour and 43 miinutes.
10 or 20 days
According to VIA Rail's website, You will be able to take a train from Montreal to Toronto, then transfer to the Niagara train.
From Niagara Falls, NY USA to Toronto, Canada; It's 81 miles or about one and a half hours, 90 minutes, according to Google Maps.
Take the GARDINER EXPY WEST to QEW. Gardiner EXPY becomes QEW.Take QEW to Niagara Falls. HIGHWAY 420 will take you to right to The Falls.
Approximately 1 hour and 30 minutes in good weather with steady traffic conditions.
7 hours
Check Mapquest.com
It would take you 28 hours
Take QEW WEST to Niagara Falls.