Draft Arena's interface level [1]
Since Draft Arena isn't open 24-7, please consider blocking access when clicked on the very first interface with the pop-up "Currently not available."
(This doesn't mean removing the panel from this interface altogether when it's closed, for we'd still be checking the available time.)

Rather than allowing access to the next screen even when it's closed only to disable the button as below:
Thanks!
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If they did that people wouldn't be able to see their battle history and hero logs in off hours. I think it would be better to add a daily currency on top of the open hours, so you could play it then.