John 11:38 - 44
NKJV - 38 Then Jesus, again groaning in Himself, came to the tomb. It was a cave, and a stone lay against it. 39 Jesus said, "Take away the stone." Martha, the sister of him who was dead, said to Him, "Lord, by this time there is a stench, for he has been dead four days.
For follow-up discussion and general commentary on the topic. Comments are sorted chronologically.
I think the important factor here is that Lazarus was raised from the dead by Jesus, not how long he continued to live. How long he lived would not play an important fact needed in the BIBLE, only that he was dead and was brought back to life after being dead for "four days".