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Technically, Sirius knew Harry from the time Harry was born until Harry was nearly 16, when Sirius died at the end of Order of the Phoenix (June 1996). However, Sirius was falsely accused of betraying Harry's parents to Voldemort, so he was in Azkaban from roughly November 1981 to August 1993, when he escaped. He didn't re-establish contact with Harry until June 1994, when Peter Pettigrew was exposed as the traitor (at the end of Prisoner of Azkaban). So, strictly speaking, Sirius only had two years of getting to know Harry and having their friendship be mutual.

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