MCT's are calculated regularly by carriers/airport authorities by procedures and mathematics published by IATA. They are based on the lowest common denominator of offloading/transfering and reloading baggage.
These are then published officially and are incorporated in reservations systems so that you cannot be sold (unless the system is forced by some idiot agent to sell an 'illegal connection') a connection that you are likely to miss (or rather your bags are. Some carriers who codeshare/interline may come to agreements below these times so that their own schedules coincide accordingly and they usually put local procedures inplace to handle te reduce transfer time for your bag. So essentially you should be OK and should not worry too much. If you are delayed en-route and your connection is tight then maybe things will go wring for you. As a regular traveller I get away with handbaggage only (yeah, sorry, I travel 1st class only) so I am very lucky.
I suggest you split you and your partners stuff over two bags so that if one is lost you both still have something. Keep all your toiletries in your hand baggage as well as your tickets, keys, cash and passports. (Nothing personal but so many people pack them in checked baggage!)Hope your wedding day goes really well and enjoy your Honeymoon.