I guess it's 1 time over 10000 times you roll. Without interruptions of sleep and such, without counting the luck you have, it would take 416 days straight to win the 10K prize.
I calculated the probability in another thread (https://bitcointalk.org/index.php?topic=319540.msg5483640#msg5483640), and it's ~ 1/20000 with current algorithm, so you need at least 20000-40000 rolls. Here's the formula for probability of rolling "10000" at least once in Wolfram Alpha (for 40000 rolls, feel free to insert other value):