As a theatre/cinema actor, you will work in various settings, both indoor and outdoor. Studios and elaborate sets are the places where you will spend most of your time. Apart from that, you will also work in theatres and auditoriums.
You might have to travel to various places worldwide for outdoor shoots. The location depends on the setting of the script. You will work in indoor locations, like film studios and sets.
An actor doesn't have fixed working hours. You might work a 15-hour shift one day and have the next whole week free. If you are a theatre professional, you might have to rehearse tirelessly for days on end before your stage performance.