Depends on your ambient outside air. If it’s 60 degrees F and under you’ll probably see it climb to 80-90 degrees after an hour or so (gut feel). I tested mine in 90 degree ambient and after 10 minutes is was over 110 degrees in there and climbing. Plastic around the motor was too hot to touch. I had to add more ventilation and a separate fan to flush out the motor exhaust. You can see here for what I did: Custom Hinged Maslow Build/Vice/Dust Collection/Silencer
It sure is nice having the vacuum quiet though!