Stop-limit orders that have been designated as day orders will expire at the end of the current market session if they haven't been triggered.

Do stop loss orders always work?

In widely traded stocks with high volume, this is usually not a problem, but in thinly traded or volatile markets, your order may not get filled. ... In short, a stop-limit order doesn't guarantee you will sell, but it does guarantee you'll get the price you want if you can sell.

Do stop loss orders expire Zerodha?

Note: A stop loss order is valid only for a trading day. If your stop loss order is not triggered during the trading day, it shall lapse automatically at the end of the trading session.