Most MEL's I have dealt with allow 10-days to get an updated GPS card installed.
Regarding the books they don't in my opinion expire. Weekly updates are sent out and manuals updated accordingly. Depending on how spread out your fleet is can dictate how often you can actually update the manuals.
The amendment list will show what has been amended. Regarding charts you could find that none of your regular airfields have been amended and therefore remain current.
If a change is needed to be notified there is always the method, if you have jeppview, of downloading the appropriate charts and faxing/emailing to the crew to use.