Pax guys on a base average 16-18 days off on a good month, and around 14 days if reserve thrown in. Most European bases have a mix of pax and freighter flying. Majority of Manchester rosters will end up having 14-15 days free of duty each month, sometimes more.
711 is right, only option at the moment is Second Officer based in HKG - perhaps will change due to unfilled slots if the rumours are to be believed.