Back testing........how long??

[Reno Gambler]

I'm back testing a formula for the 1st 5 innings, and I was wondering how many games is considered enough to take a chance with the $$$$.
System:
1- Line -150 or less
2- Line +120 to +150 for dog(pitchers meet critieria)
3- Favorite has a won 3 in a row, you through out
4- Dog lost 3 in a row, you through out
5- Top 20 AL or NL ERA
6- Top 20 AL/NL WHIP
7- Top 20 AL/NL Sargin Rankings
(Inter league #6,7 use MLB TOP 20)

The system so far is 9-2, and I finally bet the system the last 2 days.
6/5 MIL
6/6 DET

Thanks for the input.

[BettorsChat]

There's no definite answer on when a back testing/trend will be good. You just have to try it out and if it's winning play it smaller. Or continue to back test it.

[Reno Gambler]

Thanks