We log seat time and seat time counts for the 100 in 28 and 900. So technically we could do 1800 hours a year in the aeroplane - 900 in the bunk and 900 in the seat and it would be legal!
Fatigue is bad enough when hitting 900 hours (which I have done a few times over the last few years) on a LH roster but to count only seat time sounds dangerous from a safety, fatigue and health perspective. Other countries should be cracking down on airlines that use this and not allow crews over the rolling 900 to operate in their airspace. Wish you luck on your search prisoner24601 sounds like you are making a good call to leave them!