If you're looking for a math answer... use this formula to find the odds:

p = 1 - 0.505 ^ x            and        q = 1 - p

where:

"p" = is the odds that you win at least 1 time in "x" rolls

"1" = 100%

"x" = number of rolls

"0.505" = is the odds that you lose each roll (you can change with your lose chance)

"q" = is the odds that you bust after "x" rolls (you never won in "x" rolls)

So, if you're playing at dice, like i think is , at 49.5% winning chance (and 50.5% you're losing)...
which is your odds to bust after 20 rolls?

p = 1 - 0.505 ^ 20        =    0.9999988363361    =    99.99988 % (you win at least 1 time in 20 rolls)

q = 1 - p       =    0.0000011636639       =     0.000116 %  (you never won in 20 rolls... you BUST)

it means that it happens  one times  every  1 / q  =  859,354.662


  Good luck