If someone came in and bought every item from a coin shop, how long do you think it would take the coin shop to get enough inventory to open again?
Depends on how busy the shop is, how much advertising they do, what kind of prices they are paying... I basically sell my entire inventory To a wholesale dealer 3-5 times a year. If you have a slow shop that doesn't do much advertising and is not offering competitive prices it could take a LONG time.
The buying, and selling, of coins is easy. There is always somebody out there willing to buy whatever you have, and there are always plenty of coins that can be bought. The only time there is ever an issue or any difficulty at all is with truly rare coins or scarce coins. But even those can usually be overcome if you have the money.
I have to wonder why you ask, but I know that it wouldn't take but a day or two if they were willing to pay greysheet bid prices. The reason I say this is simple. There is a coin shop in Helena, MT that specializes in dealer-dealer sales. They have just about everything a coin store would need for a basic inventory. All they have to do is place a large order with a dealer like that and then it just depends on the speed of the shipping service they selected. If they just sold every coin they have, presumably for at least grey sheet ask prices, then it would be safe to assume they could afford to replace that inventory at grey sheet bid prices and have a healthy profit leftover.