I took mine out only when it was a VERY nice day. We have lots of wind up here, so I didn't take them out then. You can put them in a bottomless cage so they can play in the grass. I didn't have one, so cut the bottom out of a cardboard box for the same effect. They loved it. I didn't leave mine out too long. I would sit there with them in the sun for maybe a half hour or so. But, mine were so babied that maybe you shouldn't go by me. I don't know what the vets here would say, but I don't think they should be put in an area where they can eat too many rocks or anything like that. They just kind of pick at the grass and maybe get the occasional little bug or worm. I never gave mine any grit until they were grown. I do recommend using a cage or box because those little buggers are hard to keep up with! They love being outside and I guess the time they are out is up to you. I just wouldn't leave them out there too long though. Good luck and have fun with them! Mine used to get so excited when I took them outside. It was the highlight of their day.