Our little guys are settling in quite well and getting used to us

We are at the stage where we are having them in the bonding pouch during the day. The next step will be having them in the pop up tent with us.
Just wondering how long to leave it before we do this? And how do we get them back in the pouch after we have been in the tent with them for a while?
Will they go back in when they are ready?
Just want to make sure we are prepared before we do this ... Any advice is welcome ..