macs from my limited knowledge and in relation to sample size I keep asking myself that question everyday.

The facts however are the larger the sample, the more confidence one would have on the events continuing. How large sample, that is up to the individual.

Another factor is the dividend of winners.

If you have 500 bets and have a return of $600 you may think ok all aboard. But within the $600 turnover you might have 2 winners paying $80, another paying $60 etc..... the chances of the next 500 bets containing these winners may be slim. not impossible tho.

This is why I'm currently reducing in some cases the Profit on Turnover to generate a larger sample but also a larger dollar turnover.

To know the long-term strike rate of any system is one of the most difficult elements of a system to measure especially off a small sample regardless of the testing period.

Good luck.