45 days is enough to create a backlinks, from the following ways you can create backlinks. Classifieds, forums, web 2.0 blog creation, blog commenting, directory submission, article posting. Etc.., but while you create a backlink you have to use quality unique content.
45 days are mucg enough. You can as many backlinks as you want. But create a quality backlinks is important thing. And use different ways to create backlinks like articles, blog, bookmarking, PDF, web2.0, social networking profiles, ppt submission,video sharing, press realese ect. These are the quick ways to generate backlinks.
45 days are enough to bring a lot of back link for your niche.
use all the avaliable methods like forum posting, guest bloging ,directory submission etc but your attention should be at page rank of site you are linking with.
Press releases, link wheels, and article directories??!! Noooooo! That's low quality, waste of time crap. Create quality content and place it on your own site or on industry-related websites and share it with friends/industry folks/social networks.
Look for blogs, communities and industry news websites in your field of expertise and see if they take article contributions or do interviews. You can write something of high quality and then include a link to a relevant page of your site in the contribution. Your link should be editorially relevant, not anchor text rich, or you're going to look like a spammer and people won't want to work with you anymore.