Web alarm clock for 12:35 p.m.
You are halfway through preparing the hall for the quarterly meeting when the 12:35 pm alarm tells you to break away from the task. It leaves enough time to check the seating, presentation screen, microphones, and drinking water before 1:00 pm, without letting one unfinished detail absorb the rest of your preparation window.
While you move chairs or speak with colleagues, set the alarm volume high enough to be heard over air-conditioning, conversations, and equipment checks. Keep your phone close instead of leaving it across the hall, and test the sound before returning to work. The alarm may not sound if the browser is no longer active or the phone goes to sleep, so hall preparation could continue past the moment you meant to stop. A separate phone alarm is a sensible backup when the meeting schedule cannot shift.
After a busy midday setup, think about the sleep you want to preserve later rather than using the alarm as permission to stretch the job into the evening. Note any remaining hall tasks, assign what can wait, and leave at a planned time. Finishing the essential checks around 1:00 pm can keep unfinished details from following you home and taking over the hours before bed.