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Twenty minutes is the classic power nap, ending before deep sleep can begin so you wake without grogginess. The room stays silent until the double chime, and if you peek before drifting off, each of the twenty rings stands for one minute left.
It is a clear double chime after twenty silent minutes, and the contrast does the waking. Set your volume before you lie down.
Yes. The countdown follows the clock, so it stays on time in a background tab and the chime still sounds at zero.
Add it as a browser source in OBS; the background stays transparent. Change t for any length.