I just ran quite a long print (8 hours or so) after mounting this. After about 2 hours in, I checked how hot does the motor get. Unfortunately, it's pretty hot. I don't have a right thermometer to measure this, but touching it, it seems a bit hotter than the heatbed - so 65-70 degrees, maybe?
It might be a good idea to mount a small radiator somewhere on the motor to help it cool a bit.