If the task is declined or the child thinks it might expire before lunch, I suggest choosing a timer. One of my mothers was away and her son was sad. The maximum pain emotion is about 90 seconds, his timer helped him balance it and gave him something constructive when he was injured. Oh he was hugged, relax, but the timer gave him the ability to regulate himself. Unlike a mechanical timer, the sand runs silently, allowing someone to forget they started a task they didn't mean to complete. I don't recommend such a timer for things like cookies in the oven.
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