I've been around for about 7 months; joined late October last year.
In my short history there were none for the first couple of months, then just about Christmas time 4 or 5 went up for Auction around the same time.
I recall only one more sold since then, but I haven't been watching the Estate auctions that closely.
So I guess the answer would be "a few times a year" :-)
Hope this helps you some.
PS. It's a rare enough event that there is probably at least 1 Forum post here for each sale so you can probably figure it out precisely.
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