I honestly wouldn't have any idea how many hours. CD is my main source, I like to play LP's but it's usually weekends when I have the time and energy. I really think it was getting fully broke in around the time it was placed on my Clearaudio, it began to really sound good shortly after.
When you think about it, an average of 40 minutes or so per LP, and only playing occasionally, it would take between a year to two, in order to get 100 hours on it. I would have to have well under 200 hours, just guessing, knowing my playing habit.