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With my Russians I've found they really enjoy the play pen & can spend a lot of time in there, you can generally tell when they've had enough & are ready to come out so I don't have a specific amount of time, it depends on the individual ham. I've had a couple spend most of the day in there!
If you have the space you can make the play pen really interesting for them with lots of toys, cardboard, a wheel & just about anything else you can think of to keep them amused!
Some are a bit more cuddly & just prefer hand time or running around on me.