According to the skill guide fruit trees should take 14.6 hours to grow. I have noticed two times now, Sunday and now today that when planting my apple trees and paying the farmer to watch them that it is taking a lot longer for my trees to mature. My first problem was on Sunday (monday morning technicly), I planted 3 apple trees between 12:10 A.M. and 12:30 A.M. CST. I then checked my trees at work late Monday afternoon expecting them to be completed but they were not. I followed up with them all through the evening at home and before going to bed Monday night (again technicly Tuesday morning) at approxamatley 1:00 A.M. they had still not matured. By 8:30 A.M. on Tuesday morning the trees had matured so they took somewhere between 24-32 hours to mature. I am having the same issue now with trees that I planted yesterday at 4:30 P.M. They should have matured at 7:10 A.M. today but as of 10:40 A.M. still have not done so. I have checked all 4 apple trees.
