The rules on journey times and toilets all come down to it seems if refreshments are available on the train and even with those it was around the one hour mark. We as staff looked into the rules when we were told that we were running 313's from Brighton to Portsmouth. There were even rumours about running them to Littlehampton, then changing the headcode so it would be within the rules, but then the no trolley, no lav rules was spotted. Another way of getting round it is of course to announce that there are no toilets in advance on the CIS. Thus if you dont say so, and a train with no lavs turns up, or a train with duff lavs, then you have to do toilet breaks.