The shortest the system can by default ban someone is for 1 day in my version, however I am not sure which version you are using or if one of the newer versions allows for shorter times.
An alternative to this that would be some work, and not automatic would be to create a user group that has no access at all, then change them to that usergroup when they act bad, then change them back when they are good. If you need help with that, let me know via PM and I will help you a little more.
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