Generally speaking , if one can work out what their average SR is say over 150 bets min.

Go to one of the theoretical expected runs of outs sites.
Then multiply that theoretical run of outs by 4

e.g.
Say ones average SR is 20%
The expected run of outs is 31 outs in a row.
That's not to say that one could have 1 winner then another 31 outs in a row, it can & does happen, so we allow for this by multiplying our 31 x 4 = 124

So we should be betting to 124th of our bank at level stakes.

Some stats.
This also applies to place betting as well.
70%---6 outs
60%---8
50%---10
45%---12
40%---14
35% ---16
30% ---20
25% ---24
20% ---31
15% ---42
10% ---65

Cheers.

__________________
Cheers.