I can handle 30% drawdown in my portfolio. More than that I'll have to be on suicidal watch. How about you?
5% for the whole capital. Trading stops once over. My trading style is the "Small lost trading" so makes it easier.
Buy-and-hold has seen drawdowns of 30% to 65% in the most recent ten years. It's actually rather fun to grab the data off Yahoo Finance for the Dow, the S&P 500, the Nasdaq 100, the Russell 2000, toss them into a spreadsheet, and calculate the drawdowns. (If you prefer, you can use Total Return series such as SPY etc.). Quite illuminating. If your mother can stomach 40% DD's in her B&H IRA, maybe that means you can handle 40% DD's in your actively traded account?
My worst drawdown was 50% over a period of about four months, slowly bleeding. I was totally off my game. The following six months after the drawdown I quadroupled my account, as I got my act together. I'm a pure discretionary trader, and I believe 100% in myself and my abilities.
-5 % will give me concerns. -7.5% will make me feel like a failure and is time to regroup. -10% is time to QUIT...