I don't think we have to worry about trees here. We have more forest land now than in the 70's. Here's a link to give you an idea what we have.
Tree Crops for Marginal Farmland: Loblolly Pine - Home - Virginia Cooperative Extension
Yes I have an idea how long it takes to grow a tree. In this area some pines are thinned at 7-9 years. Cut for pulpwood as early as 17 years. Saw logs from 20 on up. This area has been supporting 3 OSB mills since 1995. Those 3 mills produce between 4 and 5 million board ft. per day together. All the left overs from making OSB is either burned at the mill or the power plant/plants soon. We also get some wood from northen NC because it's within range of our mills. We also have a chipping mill that's used just for paper right in the middle of the OSB mills. Then we have 8 local saw mills that deal in hardwood and export hardwood. Almost forgot there's one plywood mill just over the border in NC. too. Most of the wood that goes to the power plant is what use to be left on the ground to rot from timber harvest. After most timber harvest now there's little to be done ahead of replant.
Once we lost tobacco we turned to trees and the industry soon followed. It may happen but it's a little hard to outsource an OSB mill.We use up to 130 loads of wood per day.
I make my living at one of those mills. Been there 18 years and even in a hard hit home building market we're still running. We don't drill baby drill. We cut baby cut and plant baby plant.