How long do I have to wait after laser hair removal before I go in the sun?

Thank you for your question.  You need to wait two weeks before and two weeks after sun exposure in order to have laser to prevent burning.  Always wear spf 50 broad sprectrum and wear a hat when you do go outside if you are having laser treatments on your face.  Exposing your skin to the sun after laser treatments can result in hyper pigmentation. Exposing your face into the sun before laser treatments can result in burning. 

I would say by around a week you should be fine.  I has more to do with the inflammation resolving and how much sun you are looking to get.  If you are staying mostly in the shade and wearing a high SPF you should be fine.