If anyone searches regarding this issue it has just happened to me.
I was being silly to get to the end of the Celeb Big Brother thread currently running.
12 posts to fill and a double eviction happening live in the next 10 minutes. Lets get to a new thread in time for that I thought.
I had posted 3 times in a minute and on the fourth time got this message in the posting box with a red warning triangle!
You've posted too much recently. Please try again later.
Then after a few attempts..
Your account is on cooldown for posting too much. Please try again later.
I was kicked out at 22.17 and tried to post every couple of minutes until I managed to post on the new thread, having missed all the eviction excitement of course, at 22.33
So maybe 10 or 15 minutes is the lockdown time.
Lesson learned.
Don't get excited on a Mumsnet thread 😎