Try again.
Ideally you need to work your project plan backwards from the wedding day taking account of your departure date.
Once you've made eligible application for the marriage licence you need at least 10 days for the bans before the wedding can take place.
Your eligible application may well involve a counselling session. Take heed.
Have your fiancee check out the local requirement and have confirmation.
On the other hand, if you're able to stray beyond your 30 days and you can manage the extra days from work then go ahead.
Do check everything and maker sure it all fits.