it shows 6 days for any domain i check... anyway, sorry to spoil the party but if it was THAT easy to determine, so many thousands of webmasters wouldn't be breaking their head over the PR update subject..
i was watching this thread when i was banned i have used dnscoop.com many times. As the site has got popular, you can only check it once every week. Therefore the "next update in 6 days" means DNSCOOP.com will re-cache your stats in 6 days and 23 hours time. Nothing to do with pr update
the site doesn't do .in extension ... lol http://www.smartpagerank.com/result.php?domain=http://www.idk.in here is something which i use
Results for http://www.yahoo.com (whois: yahoo.com) Next update in for www.yahoo.com: 19 hours We'll see if Yahoo holds on to its PR 10 in 19 hours . . . maybe. Ha ha
I image it just averages the time between previous updates. These guys keep track of it and used to estimate based on average but I guess they don't anymore. It's been 89 days since the last update. http://www.seocompany.ca/pagerank/page-rank-update-list.html
mine said 6 days when I first checked my page on dnscoop.com too. I think it just updates its own page with your information after 6 days... its not telling you when your page rank will update.
the only thing the site does different than any of the regularly known tools is that it displays the same info with better packaging and colorful icons . the link value is a no meaning calculation and it even tries to earn commission by redirecting to a TLA affiliate link
i am unsure which part is the dnscoop tool .. it is probably because it was unable to connect any of the actual tools , like TLA , or Alexa or ipneighbour.com