Ohh really? Ohh right, once you already put item then have wait for 24 hours to expired or someone already buy my auction then I can sell again.
Nope. It's like this.
You can always sell an item in the /ah
You can they do 3 things:
1. Actually sell it and then go to the next item...
2. Change your mind, cancel the item and take it out of the expiration menu and start selling again with items...
3. Wait until it expires because no one wants your item due it not being interesting or waaaay to overpriced like most people do sadly... than it's the same as 2. The item goes in the expiration menu, you take it out and start over.