When to remove blow out tube?

Well I had my first messy blowout so i removed the airlock and put a sanitized blow out tube on.That was a day ago and now im wondering when to put the airlock back on.The blow out tube is bubbleing away but the foam seems to have gone down from what i can see.

I usually remove mine as soon as I can just so I can get the blow off tubing cleaned. And the active fermentation helps to keep anything from going into the fermentor during the switch. I think it’s kind of up to you though.

I open mine up and take a peek inside real quick to see when the krauzen has started to subside. Usually on the third day.

I guess it doesn’t really matter a ton. I usually take it off to clean it after a few days but there is no harm in leaving it on there.