There's no single punishment that goes over a month, unless it's permanent. That means if you appealed and it has been denied and you want to appeal for the second time, your punishment is already expired.
Now your thinking "but what if I am permanently banned?" Well, if you're permanently banned or muted, that means you didn't learn from your previous mistakes and you kept doing what was against the rules, so those people don't deserve a second chance to appeal.
"What if I'm permanently banned by Sentinel?" If you are permanently banned by Sentinel and you weren't doing something that's against the rules (butterfly clicking) or you were not using illegal modifications, than state that in your appeal. If your appeal gets unfairly denied and you still weren't doing anything that's against the rules, start a conversation on Discord with CrazymanJr. He will go a step further and will give you the end result, so if he says you stay banned then you were definitely doing something that's against the rules. Same goes the other way around.