Just multiply the multiplier with 10 and you got the red streak which can happen easily. So 20 reds on 2X, 70 reds on 7X and 100 reds on 10X. Bigger numbers are also possible but they are more rare.
I saw a discussion about that, and I saw that only on x2 and x3 until now, with x5 and over I never saw (or had) 50 reds or 70 reds on x7. These days I have fun with waiting losing streaks on auto betting (simple set up, stop on certain number of losing streak), and when it's stop I rise bets a lot. It's a bit of waiting, a thousand of rolls sometimes to get some longer losing streak, and when it happens you increase your bet exponentially, but still you need to expect more reds, so it's never all in after long losing streak!
I got 121 reds on 10X and 61 on 5X. Maybe that's because I just roll a lot. Last time I did 10mio rolls within 4 hours :-p