Basic, no that's not right. We do not have any kind of '5 on 3 off' kind of thing; that's a short-haul concept and is irrelevant to our operation. There are mimimum times at home between trips, which vary depending on the length of the trip and the time zone changes, but remember we are on a 750-hour contract. As I said in my previous post, you can have months with 90 hours and 15 days off - and yet only two or three trips.
We do have a rotating group system for roster bidding, but I don't generally bid for trips (though I occasionally bid for specific days off), so that's not a factor in the rosters I've quoted. The fact that it may be a month where your group is top doesn't alter the fact that your roster will contain around three or four trips and 75-80 hours unless you have leave.