...and, yes...I know, I know...let me preempt the question...
Q: OK, Ed. How long would someone have to wait after buying a book on the boards before selling it back on the boards for a profit, without it offending your delicate sensibilities?
A: See, this is why it shouldn't bother me. There's no good answer. In the absence of a good answer, I'll just say 50 days...same as the typical gestation period of the female wolverine.
I would have asked you that question, but if it's 50 days to make you okay with it, then 50 days it is.