How long does it take for "tell event clean <viewname>" work?

I’m getting used to using DDM for monitoring and fixing (small) problems, and there’s this event that happens frequently.

“Database events4.nsf in view contains 17 duplicate documents”

And then it recommends running ‘tell event clean ’. I do it but the event repeats several times a day.

So how long does it take for the command to clean the view? Or should I just ignore this event? It happens in all the servers but everything seems to be running smoothly and with no big problems.

TIA