I always keep mine in for 6 weeks Betsy. As a guide, you need to make sure he is comfortable with you, and will respond to either a name, or a rattle of a biscuit tin. You do need to keep a tray down all the time though, regardless. Partly in case he needs to go while you are out/asleep, and partly cos it is easier to keep an eye on things, and sometimes (especially in weather like we have at the moment, they might not want to go out, and I can't blame them!!