Set yourself very strict turnaround targets, but always give a longer turnaround to the client. e.g. "it will be 7/10/14 (as appropriate) days to send you the proofs", but always turn them out quicker. The bride gets what she wants quickly and thinks you are wonderful for getting them out in say 3/7/10 days, despite the fact you quoted slightly longer. Win/Win situation.
Of course the first rule of wedding photography is:- the bride is always right!
So make sure you stay on the right side of her. (or him if it is a 'civil' wedding).
If they are going away, make sure that you know when they are back, otherwise the package my end up stuck in the depot.
Any special days such as forthcoming Christmas/Birthdays/Fathers/Mothers Days etc.....why not send out invites for reprints say 6 weeks in advance with a deadline imposed for orders. Get the extra business and give yourself time to produce the goods.