Does anyone have any idea how often let's say 15-20 red streak come and go? Would like people who have somewhat of an idea, thanks!
There is no definitive number. If there was, then everyone would be drowning in money.
I don't get people who are trying to find out how long red streaks are in this regard. There is no limit to them. There is always the tiniest odds that you'll be completely overwhelmed by some black swan event. And since expected value is negative in the long run, I don't see the point of preparing for these streaks.
Have some fun and relax. Don't take gambling so seriously as if it's a profession.