Ok first question trips on average are 4 per month sometimes 5 days off between trips can be between 2 and 4 not including the day you arrive back. it a 4 day trip to LA with 2 local nights they stay at about 5 different hotels depending on what day of the week you leave LHR.
Crew do commute but when yur on stand by and the roster you twicw a year for a 2 week stint then u have 1:30 call out satying that you can always try and swap with other crew or let crewing know that you want to be first call out.
Staff travel is not very good at air NZ you get it after 6 months but i think that is only with AIR NZ you have to wait a year for most of the big carriers.
Pay it anout £10000 basic £5000 overtime and evey trip you get about $290 US down route to pay for food/shopping etc.
Yes you can have married rosters at Air NZ
I hope I have answered all your questions let me know if u need any more info
captaincc