there are people who achieve PR 5 within a month just write up some good article that will land you front page on a social bookmarking site
Getting PR3 depends on your work. If you work everyday for building your links it is possible within one PR update, but I'm not sure its possible within one month, because sometimes one PR update to another PR update takes few months.
Worry more about SERPS than PR. You maybe best going after some niche phrases first to build your revenue. For niche phrases you probably will not even need a pr 3. Itdepends very much on the market. Work for money NOT PR Aphp
I achieved this for my webmsters blog, I stuck to a relentless link building routine over the course of 1 month and after a month the PR update occured and i had a PR3. My best advice is for you to do Article Submission (Important) Direcorty Submision RSS Feed Submission Forum Posting
Please forget PageRank. It is not important anymore. Try to get real traffic through results in search engines by Google, Yahoo and MSN.
Although it is very hard to get Pr within month, but i will suggest for good quality content and high pr links