You can hold trades over the weekend if your challenge includes the Swing Add-On.
This option is available during purchase and, if selected, allows you to keep positions open beyond the Friday market close.
Without the Swing Add-On, trades are automatically closed on Fridays at 20:00 UTC, and trading resumes on Sundays at 21:00 UTC.
Check your challenge details to confirm if the Swing Add-On is included.