I have around 12 cord of oak stacked outside that I felled late last winter, bucked and split this spring. I try not to burn my premium firewood (i.e. oak) until it's
really cold outside... like January-February. Probably only burn 2-3 cord of oak a year, so I'm good for 4-6 years on the oak supply (hopefully). Been cutting elm and ash, standing-dead and blow-downs, the last few Saturdays and stacking it in the basement... about two cord so far. Figure another 3-4 cord of that and I'm good-to-go. Should have no problem getting that done by Halloween... worst case by Thanksgiving. Either way, I'll keep cutting until the snow gets deep enough to make the work miserable.
Sometime around late winter I'll fall a couple more of the big oaks for early spring work and I've got a huge Sugar Maple I felled last winter that I still ain't got a round to bucking... should get to that sometime in November. I figure that by late spring I should be around 2-3 years ahead. Not bad considering last Halloween I didn't have a single stick of firewood, and spent every Saturday last winter, in all kinds of weather and deep snow cutting to feed the stove.