SQ consider SYD-SIN a 'short sector' and use them for line-checks. DRW-SIN, is hardly worth ironing a shirt. If you are suffering fatique on a sector like that there is either something wrong with the roster or the way you're managing your own rest.
Well you must be made of stronger stuff than me....either that or you're comparing apples with oranges. ie An aircraft where one can retire to crew rest v's an aircraft where one is stuck in the same seat for the entire duty.There is a big difference. Every person is different but for me, a 13 hour trip to LAX is less tiring than a DRW-SIN-DRW, even though it is a shorter duty time.