™A broker can keep an unfilled order active beyond one session but still impose its own expiry period; verify the actual order policy.
Orders & Market Structure
Good-til-canceled order (GTC)
An order that remains active until filled, canceled or expired under the broker’s policy.
Plain-English context
Put the definition to work.
Broker expiry, corporate actions and session eligibility can cancel or modify an order despite its label.
Further reading and verification. Examples are hypothetical, not current quotes or recommendations. Product terms, tax treatment and market rules can change. FINRA — order types and execution