Between 5 hours and 5 days, depending on where you fly. Shortest trips I know of are from the soon to be defunct bases of BHX and MAN, where an early 2 sector day would report at, say, 0530 and you could be clear by 1000 (sounds easy, but they are despised for complex rostering reasons). After that you might get a 3 sector day leading to a nightstop, or a 4 sector day that could easily be 12 hours on duty or more. Tours generally are 3 sectors day one, 2 to 4 sectors on middle days and 3 sectors on the last day. This pattern also applies at LGW/LHR with more of a tendency towards 2 sectors on the intermediate days. At LHR there are very few 4 sector days with tours following the 3,2,...,3 pattern and occasionally some positioning. This is because the size and scale of LHR make it practically inpossible to turn around an aircraft quickly enough to accomplish four sectors in a legal duty day, plus many of the sectors are relatively long for short haul. Positioning still exists because we operate three short haul types at LHR (A319/320, 737, 757/767) and when the aircraft change to meet pax demand then crew end up in the wrong places. Generally in BA you'll spend much more time away from home than in low cost operators because of the route structure and a corporate strategy to be the first and last airline into London on a working day. You'll also tend to do fewer sectors than the low costs (because of the increased turnaround times) but the sectors will be longer and more varied. Additionally, BA tends to operate a significant service over Christmas, so expect to see BA crews stuck alone in hotels all over Europe on 25th December. Hope this gives you a better insight!