yes, 250mg a week would be sufficient . in fact thats a dosage you can stay on as a therapeutic dosage nearly year round if you wanted to.
BUT , if you were going to use Deca for a cruise and your cruise is only say 6 weeks, then you'd want to start the Deca a couple weeks before your begin your cruise (because its such a long ester .. I do this with EQ as well), or simply cruise using NPP instead