How many visitors are needed per day to get PR 1?

The amount of visitors are not related to the pagerank. The page rank also without correlation to the visitors. The more backlinks from authoritative sites, the higher of your pagerank. The page rank only updated in several months, therefore you won't know what the exact of page rank of your sites, if it's new.

to be honest pagerank is nothing it doesn't help you much as you will see online lots of sites page ranked no sales no traffic,

PR depends on lots of things not only no. of visitors. Your website's quality backlinks and also quality of content you use in the promotion of your website

A really informative post...

good answers people : )

zero visitors a day are required to achieve any pagerank. Pagerank and visitors have nothing to do with each other.

How they find your sites and no of minutes spent on your site may count to get page rank, i think not necessary visitors you sent.

I think the number of visitors does not define or responsible for getting a pagerank. there are other factors also behind it like Good and high quality content and many more...

its about seo your keywords are the key to page rank i have seen sites with no visitors and page ranked and what laura said above too

Many websites have the customers that you need and guest posting allows you to steal some. It is not exactly stealing though, but there is no doubt guest posting on highly related blogs gets you the right traffic you need. You might even get them to sign up to your newsletter and hang around your website for years to come.