I don't know how long it takes to update a site or change servers or whatever, but they have been off the air for two days now. I hope they get it fixed or give or sell it to someone who can....I enjoy the site for the most part.
Generally it takes about 72 hours for DNS to propagate to all the various nodes once you make the switch. It really depends on how fast your ISP and router / modem update it's tables. If you reset your router / modem it generally will pull the new website.