I contacted Steiner about this recently and was shocked when the lady on the end of the phone said I would need to be able to do a full set in 1hr 15 mins. (thats me out then!)
I seem to remember that you sign up for eight months at a time and have to share a very tiny cabin.
Also if you have any tattoo's you have to discuss it with them before hand!
Dunno if you have their number already.
Tel: 020 8909 5015 ... just in case.
Sorry cant be of any more help.