rarity of manastones

[guineapig]

I feel that I just have to ask this.

How rare of a drop is it exactly on this server?
I keep hearing about people having multiples and while I know that some of it is just joking around and BS, but I can't help but wonder. It seems to be camped constantly... frankly I would love to know how many exist on the server by now.

Do you have to camp for one for hours? Or days? I would like to at least get my hand on one truly classic rare in game item (it's part of reliving the 1999 experience after all).

It would be neat to get one of these if I could theoretically get one within a few hours. But if it's much rarer than that I don't think it would be worth what little time I have to play.