I am afraid you are going to need longer than the time window you mentioned.
There is all sorts of paperwork required by the Chancery... baptism, confirmation, birth certificates, to name but a few.
http://www.gov.ph/faqs/marriage.asp
And more or less the same stuff required if civil wedding.
I am now collecting all the paperwork required, bit by bit, taking into consideration that every certificate only has a 3 months life span...
I will be visiting the County Court In December for my Certificate of no Impediment, so they can post it here for 21 days, to cut the waiting time over there. by the time I get married all the documents will still be valid for the purpose. I also have to make a few copies of each, just in case...
Then when In Phil, you take the CNI to the local Consulate/Embassy and swap it for a Legal Capacity to Marry.. You take all the Bits and bobs to the local registrar (dont know what they call it there) and apply for marriage licence. It takes 10 days to be issued. I allowed 14 days for myself... if it means a short honey moon... I will make it up before the wedding. But keep on browsing on the site, and you will find the answers there, Also I suggest you visit Pete's site...
http://www.british-filipino.com/
It is an absolute mine of information, I don't think that there are many people around with this kind of knowledge.
Dom