Added durability to match the amount of logs you're cutting down. So if you chop one Jungle log to knock the whole tree down, giving you 64 logs, your axe durability will be changed as if you manually cut 64 logs.
I will be adding a config to have this as an option eventually. At the moment, once the axe reaches its max durability it "stalls". As in it will probably be at or above max durability for a while (without the axe breaking) if you are only chopping down trees with it. Breaking normal items will eventually cause your axe to break.