I welcome someone to correct me if I am wrong, but I think there is a forestry method referred to as a "hundred year" plan.
Here again, I'm going on a fading memory of a seminar some years ago.
It seems that in order to maintain a constant and predictable flow of hardwoods (income for PGC) in perpetuity, that cutting rotation should be 1% percent per year. I don't think this is just for timber harvest purposes but also to have staged forests with all stages from seedling to old growth.
Being that the PGC mandate is for "all" wildlife.