This should be in your own Part A or B, Vol 1 or Vol 2 and MEL. If you don't know where to find it, ask your Engs or your Captain, how on earth do you know you are legal to dispatch? The MEl will tabulate based on number of crew, minimum for dispatch, but obviously ETOPS and OE Routes require different quantities. For pressurised flight above flight level xxx there is a minimum crew time requirement..go find! could be interview question