from the faq:
http://members.cox.net/vpfree/FAQ.htm
7. What is the long term? - Theoretically speaking, the long term
is forever. For video poker purposes, the long term is when you have
played a lot of hands (several million at a minimum) and actual
results are about the same as expected results. Tom Ski calculates
(with a 95% confidence factor) that the actual results for 10/7 DB,
played with perfect strategy, should be within 1.0% of expected
results after 1,085,465 hands, and within 0.1% after 108,546,482
hands.
at 100N0 your odds would be 68% of being within +/-10% of the total
expected return
at 4N0 your odds would be 68% of being within +/-50% of the total
expected return
at N0 your odds would be 68% of being within +/-100% of the total
expected return
for full pay deuces wild plus 0.25% cashback:
N0=variance/(er-1)^2=253,210 hands
4N0=1,012,840 hands
100N0=25,321,000 hands
(formula works for negative or positive games)