PENKO: You are "muddying the waters" of this arguement by extending your case into the block of work the commuter does when he is away from home! That was not the original point of this thread! It was about people subjecting themselves, voluntarily to extra travelling fatigue by commuting before a duty.
At one stage I commuted from the south of the UK to Frankfurt for two years on an, albeit, long haul roster. No matter which LON airport was used (I preferred LCY by the way!) public transport to airport (allow 2 hours), one hour at least check-in time, flight itself ( 1:45 usually) + ensuing public transport to HOTAC. Very rarely was this less than a 5 hour journey. Tiring - you bet, especially when you have to travel to fit in with available flight/train timetables which I put to you probably does not affect your based colleague.