The good rosters are 11-12 days away per month. The bad ones are 16-17 days away. Trips are 5-11 days in length.
So a bad schedule would be 6 days on, 4 days off then 10-11 days on or some variation of that. Others can get 6 on, 7 off then 6 on. Remember if you don't live at your base then the commute is on your time. What is frustrating is that some work much harder than others for no reason at all!
As for going to the passenger fleet, yes you must go to Hong Kong but as soon as you arrive you can bid for a NA base if available and often start that base the following month meaning only one month approx. in HK.