As most punters i also found the hardest part was the pshycological part of punting apart from staking and selection criteria obviously.
The quickest way to answer this for my benefit was to look at the s/rate of my system based on 1,000s of bets
I then calculated the longest probable run of outs that s/rate would get.
Then doubled the amount of losses that occured.
I then made sure i had the necessary punting bank set aside to carry me over that particular amount of losing bets.
Eg say i have a system with a 30% s/rate.
All my bets are for $100.00.
Looking at my chart i see the longest run of outs over 10.000 bets is 23.1
Then i double that amount to read 46 losing bets.
So for me a punting bank of $5,000 dollars is required for this system with this s/rate betting $100.00 per bet.
This always holds me in good stead through runs of outs providing of course that the system is profitable to start with.
Hope this helps those aspiring to become pro punters or just those wishing to add to the bank balance or just have a bit of fun.
cheers
garyf.