Essentially the answer to your OP question is infinite. You can get as many reds/greens as the universe can give on any betting streak regardless of whether it is martingale or not. This is called luck and you cannot use martingale to evade your bad luck. If there was such a method then casinos would have gone bankrupt a long time ago. A real martingale assumes that the bankroll is infinite and that the maximum bet outcome is infinite too, which is false in real life gambling and so it will fail at one point, which site is the game on, is irrelevant.
In my case, in 2018 I loss 32 times one after another using the dice system on freebitco.in.
You should consider yourself lucky that it did not go beyond that.