Just started a new job. Everyone is very nice. Contracted hours are 35hrs pw, so a 7 hour day. My commute is about an hour and 20 mins and I accepted the job having carefully worked out options for trains/buses etc and being able to get home in time to pick up my LO from childcare. What has become apparent, however, is that no-one in my immediate team just does their standard hours. Its a small team and they all seems to work through lunch and an extra hour on top. I know this is not unusual in many places of work, but my line of work is not a particularly high-pressured/performance related sector so I'm surprised to find it here. It's not been my experience elsewhere. Everything else about it (dress code etc) is pretty relaxed.
Anyway, I don't know what to do? Part of the issue is that no one else in my small team has children. My new line manager has said she understands I have responsibilities and the woman I'll be reporting to just said "so long as the work gets done". But a few days in, I already feel terrible at being the first one to scuttle out the door. AIBU? Do I follow my colleagues' example (though I don't really know how I can) or should I just brazen it out? Anyone else been in this position?