I've looked over both examples and while the second certainly looks easier, I agree that creating and destroying threads constantly is a waste compared to just starting two workers and sending them work.
I mostly get where you are going with this, but the one thing that I can't visualize is how are we going to disregard the open timer if the user closes the showcase? The work has already been passed to the thread. Also the walk timer needs to respect multiple key presses and update the expiry time, and cease termination and "restart" work.
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