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A screen time timer is a countdown with a social function: it moves the ending from a person to a number. Thirty minutes is the usual block, long enough for an episode or a level and short enough that the end is still in sight when it starts.
Most arguments about screens are not about the total. They are about the interruption, because a device taken away mid-thing feels like a punishment for something the child did not do. A visible countdown makes the end predictable, and predictable endings are negotiated far less than surprising ones.
The tip: agree what happens at the sound before you press start, out loud, in one sentence. "When it rings the tablet goes on the shelf and we lay the table" works, and "when it rings, that's it" does not, because the second one leaves the next move undefined at the exact moment nobody is feeling reasonable.
This is a plain countdown, not a lock: it will not close an app or block a device. Real enforcement belongs to the operating system's own screen time controls, which cannot be reset by opening a new tab.
No, and nothing on the web can. It sounds an alarm and shows that the time is up. For enforcement, use the screen time or downtime settings built into the phone, tablet or console.
Long enough to finish something: an episode, a level, a video. Blocks that end mid-activity cause most of the friction, so match the timer to the shape of what they are doing.
Tap the minutes on the readout and type. Reset always returns to the thirty this page is for, so an agreed length is one button away after any experiment.