My training club is 30 minutes door to door -- mostly interstate driving, about 30 miles away. I don't consider it far to drive at all, as we're used to going that far for all of our shopping.
We go there twice a week -- once for Kaiser, once for Luke. We have agility trials there once a month, on average.
When I travel for trials they can be anywhere from 2 to 5 hours away (so far...). Next year I will likely attend NADAC Nationals and that will be a bit bigger trip for us.

Luke -- Lab/Shepherd (1-1-04)
Kaiser -- Alaskan Klee Kai (12-30-07)
Sar -- Arabian gelding (4-11-80)
Norman -- Percheron/TB gelding (6-18-00)