I have had a shooting bow out of hackberry in as little as 4 wks. Cut, split, debarked, roughed out all in one day. I stuck 1" blocks under each tip and bound it down nice and tight to a 2x4 to cut down on warp and twist. After 3 weeks baking in a vehicle parked in summer sun, I floor tillered. Back on the blocks and 2x4 for another few days in the Toyota oven. Several nites of tillering slowly, with baking in the vehicle during the day.
Because it was reduced to near bow dimensions, there was little chance of the wood checking. I did do a little heat correcting to take out a bit of twist, but it made a nice little native horse bow style shooter.