You can leave them until they run out. That is why many people set their auctions to "Continue Until Canceled". You will not get any warning or anything if you leave them up.
If Ebay left your auctions running then don't take them down. Unless they are similar type items that you received your suspension for. After the 30 day suspension is the 1 year suspension.
Best advice is re-evaluate what you are selling because it isn't really working too well if you keep getting suspended.
You can't sell Red Bull Hat's. They will pull them down every time. I tried selling them a few years ago with no luck.
But if you let them sell they will not suspend your account. But what you should worry about is them pulling down those listings and then giving you the axe.