depends on your method and goals,risk appetite, i risk 1/12th of acct balance originally, keeps you in for 12 months,if method is profitable,and profit exceeds risk, then an avg of that monthly profit is your new risk, i have a backer and its his risk so we stop at that point and just churn the same risk,size, stop and get continued monthly avg profits,for methods,you can take the best performing and become better at it,i.e, scalping,swing trading,one instrument for main and continued success,other instruments for occassional setups and smaller shorter trades...if you can be consistent risking and collecting 1/12th of your starting ballance, you make 100% return on your money per year,this is easier to do in a retail acct,where your initial balance is ,pick a number under 1 mil,,obviously if you can raise that number to 1/10th or 1/8 th the returns go up..statring at 1/12th risk and winning one 1/12th is a 1/1 risk reward which imho should be a minimum for placing a bet,if day trading that number is going to be divided by 20,bracketing your per day risk,again keeping you in business,stay in biz , then profit in biz then find a way to increase profit, grow biz
