i use the help section if i do a bid wrong search for bid retraction you can cancel a bid at anytime up too 12hrs before the listing ends
from ebay
To cancel a bid, fill in the Bid Retraction form. You’ll be asked to provide a reason why you'd like to cancel your bid. The available reasons are:
*
Entered wrong amount
*
Seller changed item description
*
Cannot contact the seller
Timing Matters
*
Up to twelve hours before the end of the listing: All bids you've placed on that item will be automatically cancelled when you submit the form.
*
During the last twelve hours of the listing: Your most recent bid will be automatically cancelled, as long as you placed it in the last hour. If you want to cancel a bid you placed more than an hour ago, please ask the seller to cancel your bid. eBay can't cancel your bid for you.
hope this helps next time double check before bidding
from ebay
To cancel a bid, fill in the Bid Retraction form. You’ll be asked to provide a reason why you'd like to cancel your bid. The available reasons are:
*
Entered wrong amount
*
Seller changed item description
*
Cannot contact the seller
Timing Matters
*
Up to twelve hours before the end of the listing: All bids you've placed on that item will be automatically cancelled when you submit the form.
*
During the last twelve hours of the listing: Your most recent bid will be automatically cancelled, as long as you placed it in the last hour. If you want to cancel a bid you placed more than an hour ago, please ask the seller to cancel your bid. eBay can't cancel your bid for you.
hope this helps next time double check before bidding