That all depends on the account size and how much profit, aka draw down, you have in the account.
Why would it be a bad idea to hold 1 ES contract or 10 MES contracts overnight when a traders has made $20K in profits?
The drawdown when the overnight margin kicks in, if the trade is negative. Sure, it is fun to hold through the ON session when in profit. But if flat or negative, that -$20K +-$17k margin requirement on 1 contract is -$37K drawdown. You have exceeded the $1500 whatever drawdown limit. Liquidated, time for reset.
