I don't think cooking, cleaning and washing a few clothes by hand is particularly tough, Peachy, not when you all "muck in" together, so I feel that BB1 and BB2 had it quite easy.
The people who had to live on the poor side in BB3 had it much harder as they had to live in a small space, survive on a very boring diet and wash with cold water (how I hated those bars!!).
However, I really feel that the FA students had the toughest job for the reasons you've already stated, especially the ones "on probation". The FA students worked their little socks off (Kevin made sure there were no slackers) and I admire them all for that.