It is a question that is very difficult to give a straight answer, as it will depend on so many factors. Your wedding venue, how many guests you are inviting, where you are staying, etc. This is another reason I endorse couples using a destination wedding planner in Mexico, it will take a huge weight off your shoulders.
Are you going to be having your destination wedding in Cancun? Playa del Carmen? Puerto Vallarta or Los Cabos? Get in touch for a casual chat about your big day.