Are you serious, some crew commute from as far away as Bangkok?
Why?
Surely the time changes and the time is takes to get home and then back again for work gives virtually no time at home. If one has 3 days off which is often the normal amount and they have 24 hours flying time and two 6 or 7 hours time changes in 3 days what sort of home life does that provide? Not to mention what does it do to their health.
Commuting from France and Spain yes, but from Bangkok seems an impossible task to me. Additionally I would expect a night or a day in a hotel would be needed after a 12 hours flight.
I recently flew from Bangkok in a club seat and felt so tired or arrival at LHR., the last thing I could have doneis go to work soon afterwards.
I am amazed it is allowed.