I think I can.
EDIT: I've assumed that you're asking for one of each number to turn up. I've calculated the odds of rolling once and turning up all unique numbers.
As far as your question, though, if you're asking how many times you would have to roll to see all six numbers...I don't think there can be an answer. You can roll a die a billion times. Statistically, you'll have rolled every number--but that doesn't mean that you did.