In my case, they did returned my documents just two days after I submitted it.What I have received back is one of the report of marriage forms with the Philippine Embassy stamp.
To be honest, Two of my daughters were born overseas and I always report their births to Philippine Embassy and that is how I found out that any reports of marriage and births,you can get it in NSO main office just three weeks after I have reported it.As I am living abroad it was easy for me to ask one of my family members to make a trip at the NSO main office and just check if the report certificate is already there.Luckily,they never wasted the trip,they get the docs the same day.