just get links what you feel is normal for one person who doesn't know the benefits or heard of what seo is.
Well it's very difficult to put a number to it but I would 5-7 should be healthy figure. However don't accept it on face value, do some research and your should be able to get an average figure. Happy searching.
Just find one the the many web directory lists, forum lists, blog post lists, and work it 15 minutes every day. Then spend another 45 minutes trying to get links from other webmasters in your niche. Spend the rest of your day on building new content so you can attract more links. Think of link building as a long term process that you work every day and you'll wake up 6 months from now feeling good about your efforts.
Well, it depends on the age of the site, newer it is, getting 100 links a day is definitely iffy, but if the site is much older, then this is a natural growth of gathering links. Plus larger the site is, more links a site will get too, if it's of any value to people who'll pass the link on to other places for people to benefit from.