As far as I remember, a 50m rope is fine for the entrance, and then no more after that - someone more local may be able to give more specific lengths, but if you're planning to exit at the toilets, you won't need any more rope after that. Of course, someone will have to go back up the hill and haul everything out - we've successfully pulled six full SRT kits, plus rope out without getting totally snagged up. I've been quite keen to do a trip exiting via the 80m Day Shaft instead of the coffin level, but it hasn't happened yet, for some reason...
