I am wondering for a 3 months old baby how long can I bring them outdoor?

There is no time limit. Actually I bring my baby out everyday since he is 1 month old. Now he is almost 7 months and he enjoys getting out of the house. He will make sure I go out everyday. Be it shopping malls, to places of interest, to indoor playground, to music classes. I've tried and he is taking everything well and enjoy every new place that I brought him to.