Realistic Stops

What is the smallest realistic stop I could use on a 30 min trade of liquid stocks, and not get bounced out immediately?
(my universe: 1 penny spread, 5 mil shares/day volume, and minimum price of $20) I am trying to do backtesting, and I would like to find a good average value to use.



Thanks,
Russell

 

1 penny, at right spots.

 

How much of a profit are you shooting for on each trade? Divide it by 2 or 3, and there's your stop