How long until your gut is colonized?

I started making l. reuteri yogurt a few weeks ago, and have been eating it daily. I’m seeing some positive effects with mood so far.

My question is: how long do we need to consume it daily? A few weeks? Months? Forever? Or will there be a point when the gut is colonized and will remain so unless we take antibiotics or something like that?

I’ve tried to find the answer and can’t. I have commented on Dr. Berg’s video but got no reply there either. Any help or thoughts are appreciated.