3MTA3 - I commute from Australia. I work for 5 months then have two months back home. That's working when I want to !
It has never been a problem for AAI. I do occaisionally get recalled early and sometimes leave London a couple of days late but it has worked well for the past five years.
As for working outside the duty / flying hours - I have to agree with 18 Wheeler - I have never been asked to and / or rostered to exceed these limitations.