A Couple Random Questions

So, I apologize if this sounds dumb, but I was just wondering if anyone has experienced chins acting the way my two do, or if it's normal. During playtime they hop out of the cage (they have full access in and out during playtime). But I doubt it even lasts 30 minutes. One of them jumps back in after 5-10 minutes. He may go back out, but not for very long. The other stays out longer, which is surprising because he's the timid chin. He probably lasts about 15-20 minutes. It just seems like a...

A Couple Random Questions