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Hello,
how long the last registered users stay displayed ?

I have the 5 last registered users displayed. The older one has been activated on April 27th and is displayed.
The last one, today, is the sixth and does not appear in Top Stats.

I don't want to change the number from 5 to 6. Is there something else to do ?

The last one has just appeared
I had refreshed the page.
I should have go to drink something and wait 5 minutes.

purge cache when settings are changed

I just refreshed the page and dit not purged the cache, because I did not make any change in settings. I just activated the user.
Now, I will purge more often. Thanks for your help.