Gents, I forgot to mention that I had leave after this pattern, hence only the 15 days. I would say that this is as bad as it gets, certainly before leave they will maximize your flying.
There are months that are quite ok, you will always have a certain amount of night flying, since that is what the QR schedule is like. Normally they will roster you for a max of three nights in a row. But where do you draw the line? Waking up at 0400 is night for me, but doesn't count as such since the flight is daytime.
The bidding system works to a certain degree, so your roster will be a combination of nights and fulfilled bids. The layovers are usually quite good and 24h.
If you bid for early report time, you will do early flights, but often 4-sectors around the Gulf. Most guys don't like these patterns since you work hard but the flying pay is low. It also gets incredibly hot on board in the summer time. But it's your choice.