Its easy to work out:

You basically have a 100-8.4 = 91.6% chance of a loss.

For 1 loss the chance is 91.6%.
For 2 losses the chance is 0.916x0.916 = 0.916**2 = 83.9056
For 3 losses the chance is 0.916x0.916x0.916= 0.916**3 = 76.86
...

For n losses the chance is 0.916**n

Where ** = to the power of (available on all good calculators)

You then determine what you think is a longest losing streak. Is it 1% chance or smaller ?

you then substitute a losing streak in n and you get your result:

For 80 it is 0.916**80 = 0.09% chance. which is less then 1%.