when you go to live chess you will see this panel to the right. click the 10 min or whatever time control that is displayed
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you will then see a display with all the different time controls that you can choose from. additionally if you click more time controls at the bottom you can make custom time controls (tho you will likely have a hard time playing a game if it is not an official time control)
When I played as guest, I was able to somehow set the Live Chess timer to a longer than 10 minute period. Now that I have registered, I can't figure out or remember how to do that. Can anyone help?