Depending on time of day and traffic, and where in Toronto you're going, you can get there in about 1.5 hrs of highway driving.
[Hmm, Question was from Cobourg ON, to FortErie ON?]
Google Maps ,shows the driving Distance as 268 Km.
Assuming you had no traffic Jams, and were travelling at 100km/h you *could* ahemmakeit in 2 and 3/4 hours.
Usual Weather conditions in the winter plus the perpetual state of road repairs through Toronto, never mind the traffic, You can add a half hour or more for snow or rain, and depending on the route, you could add another half hour for traffic jams at the more common road intersections with Hwy401.
Three places come to mind Hwy 404/DVP; Allen Road; Hwy 400, at the QEW end, the junction with Hwy403 in Oakville is a frequent delay.
The driving distance from Dover, Delaware to Cobourg, Canada is 541 miles / 870 km
The driving distance from Cobourg, Ontario, Canada to London, Ontario, Canada is 184 miles. The driving time is 2 hours 55 minutes.
17-18 hours only if you go the speed limit.
The driving distance is 155km. Since there is sometimes more than one route, including back roads, this is an approximate but accurate distance. It is based on the most well-known routes between these two locations.
About an hour
wow
The shortest driving distance is 23.7 km.
156 miles
about 35 miles
400 KMS.
4 hours
102 miles