how does it work for you in terms of the extra hours you have worked?
I am in a relatively new job and have travelled abroad once so far, we don't record the hours to claim back as holidays/time off. I was pretty much told we can take some time back at our discretion, like finish early/long lunches/later start. If we work or travel on a weekend we get a day in lieu.
When I am away I work long days and during these days I don't really get any time to myself - i might get 30 mins to freshen up before going for dinner but that's about it, lunch is usually eaten at my desk whilst working.
Some friends and family are surprised that I don't get paid for more the extra hours worked or get more time off to compensate for it.