Sorry mutt I don't know about BAH-COK flight time as I've never been there but we used to do BAH-MAA-BAH and we were well within FTL's.
No doubt it's a long and tiring day but in todays environment of cuthroat cost cutting and the airline's attempt to return to profitability, sacrifices have to be made.
Besides if one consideres that the flight is to long and tiring I think Pprune is not the place to make it known. If we want to achieve anything we can to it by addressing the proper channels. I would suggest the colleague writes to his chief pilot and addresses the issue.
Cheers
Snails