fonawah,
each states civil aviation authority will have their own rules but are generally similar. having said that, each company can have their own work-rules as stipulated in their contracts/collective agreements. on our b777, block time > 8hrs, 3 crew (2 capts, 1 F/O), block time > 11hrs, 4 crew (2 capts, 2 F/Os). i know of some company that have 1 capts, 2 F/Os or 1 capts, 3 F/Os combination but thats entirely between the union & company.
SR