What are the market hours for commodities?

Sunday 5:00 PM to Friday 5:00 PM EDT — this follows global precious metals market hours.

In European time, that's:

Not yet! If the market's closed, the app will show you exactly when it reopens so you can come back then. We're working on adding the ability to schedule orders for a future update.

Not at the moment — once an order is placed, it will execute. If you change your mind afterward, you can always sell the position back.