Think about this, I look at his experience which was 12,999,965 and than I went to the toilet and came back 5 minutes later to find that he had 13,034,680 experience for level 99. And you say it is not easy? He could have not logged out during that last 35k xp. If that's the case then there's no way to know how long that xp took him unless you knew the exact time he logged out before 99 and the time he got 99.