As I said earlier, total flying hours per se mean little after passing a certain threshold. There often appears to be a certain amount of willy waving with regard to logged flying hours hence a degree of scepticism on my part on the nature of the time being logged.
Being out of the loop for a wee while and regulations do change, may I respectfully ask whether all members of an augmented crew log the whole flying duty period or is it just the aircraft commander.
In the past I have been part of heavy crews who 'rest area' comprised at worst the jump seat and at best a seat in the cabin. The crew rest areas that I have seen, I would agree are not pleasant, though I would be interested to know if some are better than others depending on operator or perhaps newer types of aircraft.