Hey, If your fourth ban is issued, it will usually be 30 days according to the system. However, if you believe the ban was given unfairly and you appeal it successfully by proving your innocence, the ban will be considered invalid and removed.
In that case, it won’t count as an active ban on your record, and you won’t be subjected to the 30 day punishment.
Just make sure to provide clear evidence and explain the situation properly to prove that you were not at fault.