Yeah, but cutting down 250 trees and making them into firewood, without chainsaws or other modern tools seems like a lot of work (actually an insane amount of work bordering on unbelievable) just for maintenance. Even with a chainsaw, doing it to one tree is very labor intensive. That is time they are not planting/harvesting/hunting. Instead they would be burning massive amounts of calories over a very extended period of time. Though, I suppose I’m making assumption about how big the trees were. I’m assuming these are old growth forests with tall and wide trees.