Trees take roughly 8 hours to grow? Give or take a few hours. Probably mentions it somewhere in the config file?
Also wanted to post that sitting on the chair from the player's perspective is too high that it should be lowered for sitting. I say this when noting the wooden chair, yet would apply this to all chairs.
Also for the chair being to high I had to redo some of my blueprints 2 benches and a picnic table because the chair (id14 i fink it was) is now bigger then before which was a pain, so i lower the chair for it to match up with the old construction, and when blueprinted it missed out the new chairs altogether because the new chairs was sunk into the ground.