So, IMO if you equate this to a dozens style system you could miss dozens more than 16x in a row. Its happened to me on many occasions while working on systems here about a year ago. Ive personally seen it go 23x without hitting a dozen and the consensus Ive read here 26x is is about the max (although mentions of 31x are possible).
Glad you mentioned the sleeping dozen. I have tested the simple dozen for a whole year sometime ago. Yes it can go unseen 23X (very rare though), but during my testing the highest was 28X misses. And only one time in one year it went to 30X.
It is a great system as a side system. As you write down numbers and you track them for another system/s, if you came across a dozen or a column missing 17X+ of course you will take advantage of it.
Make sure you have the B/R to sustain 10 losses before a hit ( that is if it happens). A roulette has a strange way of stretching a streak once you put your money on the table.
A much better and much faster way to play a single dozen is this:
Decide in advance the minimum number of consecutive misses for a dozen or column before you will start betting on it. Let's say 7 misses. As you walk around different roulettes, keep your eyes open for at least 7 misses. And stick with it. Ignore 6 misses, but by all means use 8X, 9X etc. (if you happened to observe them in a score board).
Then decide in advance how many progressive bets you will play.
4 bets, is pretty good.
Stop when you hit, and stop after 4 bets if no hit.
Then look for another similar situation.
I can guarantee you that running into 7 misses that become 11 misses (that means you lost all 4 bets), won't happen 3 times consecutively. Maybe 2 times in a row (though rare), but not 3.
This cycle 7 to 11, or any "misses +4 more " won't repeat 3 or more times in a row.
When I research a system, is not so much what happens after a designated trigger appears, but the number of times CONSECUTIVE TRIGGERS can fail
is my primary concern.
All systems where your entire B/R determines the limit of your progression have been found to fail.
Sooner or later.
Instead use shorter progressions, and rely on the fact that identical patterns don't happen. At least not as often as a single progression stretched to the end of the B/R.
Casinos love long progressions.