Morning Bhagwan. I suspect that 20 outs would occur sooner or later and that ALL your smaller wins would then be obliterated. However, in reality, it's only the thirteen in a row, after you start betting, that count.
For example, someone who walks in exactly when the first seven "non-shows" have happened could sit beside YOU and decide to just mimic YOUR bets. Of course, this bloke doesn't know you've been waiting 2 hours for this chance NOR that the 7 non-shows have happened. You two are now playing exactly the same and IT MAKES NO DIFFERENCE what went before. You'll be winning when the "run of outs" breaks AS WILL HE (without the wait). You can work out how many spins you will see before the "knockout blow" will come (on average) by simple maths. What about doing the system in REVERSE??.