After mine had been in the run together for 8 hours a day with no signs of anything naughty (a week) we then decided to go for it...moved them both into a brand new hutch & set it up right by the back patio doors so someone in the household had a beady eye on them most of the time..the hutch was also under our bedroom window which we left open all night so we could hear if they kicked off...which luckily they didnt & it was success!!
It tests your nerves though.
Good luck! X