it is designed to run 24/7 from the ground up
to paraphrase one of the engineers
' we didn't want mom waking up in the middle of the night thinking she didn't unplug something when the fan comes on... the components were chosen with their heat tolerences in mind for always on service'
or something like that
just make sure it has some room to breathe
and about teh light....just how much heat do you think an LED outputs??