I never turn off the TT when changing LP's.
I also never shut off my belt driven turntable. It runs 24/7 and my theory is that it won't develop a spot on the belt if left in the off position for a day or two.
When I used to shut off the TT, I had a chance to removed the belt after about two weeks of non-use and I found the part of the belt that wrapped around the drive pulley developed an "image" of the drive pulley on the radius of the belt.
I also never shut off my belt driven turntable. It runs 24/7 and my theory is that it won't develop a spot on the belt if left in the off position for a day or two.
When I used to shut off the TT, I had a chance to removed the belt after about two weeks of non-use and I found the part of the belt that wrapped around the drive pulley developed an "image" of the drive pulley on the radius of the belt.