Please take a look at this.

[Skakus]

you'd need to win 15 sessions for every 1 lost session to consider it a grail

[Let Me Win]

Thanks for the replies I uploaded the graph to image shack but then it wanted me to sign up and make a free account which I couldn't be bothered with! 

In any case it is not so important I was just wondering how many spins something should be tested  before starting to get excited.

I am still tweaking my idea which is based on flat betting 18 numbers every spin or playing using a little progression 1 - 2 - 3  chips per number.

It seems to me that betting 18 numbers at a time is the way to go as it is only then that the house has the smallest advantage over me.  Rather then bet all red or black numbers or all even or all odd etc I was trying out an idea that came to me while messing about with the MST software.

So I am using various systems at the same time that each pick numbers to bet on then putting them all together to form 18 numbers to bet on in total per spin.

The idea is that at worse I have a 48.65% chance of winning my bet and if any one of the systems hits a good streak I will win.

It I play $1 per number at a time then in effect 1 unit = $18 for me.