How long can bearded dragons be outside for?

You should put it back in its cage BEFORE it starts to get cold. If it gets too cold it will go to sleep. you can tell if its getting cold b.c it will try to find somewhere warm to lay.

As long as the temperature is ok he can stay out as long as you want. The greatest risk is lack of UVB light. In the summertime I will sometimes keep one out for several days at a time, but I will also have them outside for some time in the natural sunlight so they are getting the best UVB possible.