How much time to spend on Seo?

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HI, I have started to blog recently and there are still many things I am not familiar with, one of which is Seo. I am just wondering how much time would you expect to spend on seo in order to have a reasonable knowledge about it so you could apply it to your blog? I am asking that as there is so much information about it and I am not very good with computers, not good at all. All these html, backlinks, stuff makes me really crazy... but I am trying really hard to understand it... How much time did you spend reading and familirising yourself with Seo?