We've just finished the same process after a year, in similar circumstances. The delays caused by tracking down the husband and then the court will investigate why he doesn't respond to the summons and why he doesnt attend the pre-trial and the pre-trial being deferred to another day to give him a chance etc. So it does take a long time, we started in January and have just completed.
We kept things very secret, and still are despite it being completed, as adultery is taken seriously in the Philippines (Slight different situation, but this makes the point clear http://www.thisislondon.co.uk/news/a...ice-help-us.do )
If you do some searching you'll find some good posts on here describing the annullment process, and how it works and what the grounds are for an annullment and all of the seperate stages.
ADULTERYADULTERY
Adultery is committed by any married woman who shall have sexual intercourse with a man not her husband and by a man who has carnal knowledge of her, knowing her to be married, even if the marriage be subsequently declared void (Article 333, Revised Penal Code)