How often does the database get indexed

I noticed some posts i made this morning arent showing up on a search for all threads started by me

The only threads from today that I see for you are this one and the one where to asked for help with a collection.

thats the one

ive noticed it in the past as well

im not complaining i was just wondering how often the database got reindexed?

I don't know but any thread you create should show up immediately.