They have no problem with running full time.
One thing though. And this applies to ALL air conditioners
RV Window and whole house,.
The condensers get "Grunged up" with crud that eventually clogs the condenser. then they don't work.
Now on a Coleman like my front one you remove 4 phillips head bolts from the top. Lift the cover off. Peal the crud off (Cotton wood cotton is a real bummer) put the cover back 4 screws job done.
Others it's about 10 or 12 screws around the bottom. lift the top off. Then more screws or other items to remove the condenser cover (do not even ask on Advent Air the cover is not designed to be removed) I've had to take the fan off the motor. then I cleaned it.. Reassemble and the A/C is many times better.