I have mine set at 45 seconds and that has pretty much stopped all spam bots dead in their tracks. I had it set at 25 originally and there were a few getting through so I increased it by 5 second increments until I hit 45 and that seems to have done it.
Whoever is programming the bots is a total idiot in any case. Almost all the handles that are blocked tend to be constructed to represent real names, a capital letter for the first name combined with a last name starting with a capital letter. Makes the occasional one that does get through very easy to find.
I have noticed a huge increase in bots the last couple of days though. My various protections have blocked well over 300 in the last day and a half where I usually deal with about 10 to 25 per day.
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