on 11-21-2012 11:05 PM
Ebay distributes ebay bucks every 3 months. The next time is January, and they are good only for that month. (not necessarily 30 days, in October they sent them on the 3rd, and they expired on the 31st)
on 11-21-2012 11:18 PM
"How long do I have to redeem my eBay Bucks Certificate?
Bucks Certificate will be good for 30 days upon issue. Please check the eBay
Bucks page in My eBay (ebay.com/ebaybucks) for specific dates. Your eBay Bucks
will expire after 30 days from the date of issue."
From the eBay Bucks FAQ's.