Standard Good-Till-Cancelled orders generally do not execute during after-hours or pre-market sessions, as most brokerages restrict baseline GTC limit and stop instructions strictly to normal core exchange hours. However, certain advanced trading platforms offer specialized extended-hours GTC functionalities that permit orders to participate in after-hours liquidity pools. Unless an explicit extended-hours modifier is selected, standard GTC orders remain dormant outside of regular 9:30 AM to 4:00 PM Eastern Time windows.