From: almost
But it still could take a while to sell them all.
Or, more likely, the price will crash long before people are able to sell even a fraction of their stock; Nobody is going to buy them, unless you somehow miraculously get another merch clan to start buying while we're selling, which, in my opinion, has a .01% chance of happening.
It should take as long to sell as it will to buy them out.
Put 1m towards them and you'll buy them out in a day. Put them back on the GE the next day and it'll take weeks, or longer, to sell them back.
EDIT:
From: bionicle1800
white bead - blk armor bought in shop - also there cheaper so you can buy more and it makes u feel richer :D lol
Thing is, there's such a limited supply that you're probably not going to get more than a hundred or so (resulting in a very small profit at the end, if any). Not to mention the troubles with selling them at all.