I'd budget about 45 minutes. Not because the drive is that long (maybe a 5-10 minute drive at most), but because of the time it takes to park, ride the tram to the gate, go through bag check, ticket line, and then walk to the rear of the park to get to Le Cellier.
This may sound like a lot of time, but most of it is simply due to the time it takes to get from your parking space at EPCOT to the Canada pavilion, with the usual crowd bottlenecks.