There is a thing called a 'flexi day' and this means that easyjet don't really do 6 on, 3 off.
The reality is that is 6 on, 3 off, 7 on and 2 off with maximum dicking about on days 'on', and as they get shorter of crew this gets worse. Pilots leaving at the moment for a new start at Luton and for Dragonair