Hey there!
It really depends, there's no set time.
Some appeals get finished in a day, others might take a week or even longer. It's really on a case by case basis. Sometimes the evidence is tricky to understand and needs a few more background checks. The staff team also discusses about the appeal, so simple violations do get answered quicker than more complex ones.
Luckily, there's something that the appealer can do to speed up the reviewing process! The appealer can provide with a clear reasoning behind their actions and provide clear evidence if applicable. When the appealer knows what they are appealing and shows responsibility for their actions, the reviewing process tends to be much shorter.
Hope this helps! C;