How Many Undos?

Illustrator has (virtually) unlimited undos. Of course, you could keep pressing Command-Z (PC: Control-Z) over and over again until you run out of undos, but there is an easier way to know how many undos you actually have available. Click on the Status Bar at the bottom-left of the document window (next to your document size). From the popup menu that appears, under Show, choose Number of Undos. Now, you can see how many you've got and undo away.