Set the timer to 158 minutes

How to use the online timer

When a repair crew gives you a half-day window, you may need to stop watching the clock and get on with work, cooking or errands at home. A countdown of two hours and thirty-eight minutes marks a useful point for checking whether the team has arrived, called from reception or revised its timing, without making the maintenance visit occupy your attention throughout.

While you are away from the screen, silent mode can turn the finishing signal into an easy-to-miss visual notification. That matters when drilling, air-conditioning work or normal household noise masks a quiet alert. The page needs to remain open and the device awake; otherwise, the crew window could pass without the browser sounding. Keeping the device within sight gives the on-screen change a chance to catch your attention even when sound is unavailable.

A maintenance visit can interrupt whatever you started while waiting, so leave the unfinished task at a clear stopping point. When the countdown breaks your concentration, first check messages, the intercom and the building entrance, then note what you were doing before speaking with the crew. If they have not arrived, that quick check separates a genuine delay from a missed call and makes it easier to return to your earlier activity.