[{"data":1,"prerenderedAt":85},["ShallowReactive",2],{"page:type=timer&slug=3-hours&locale=en":3},{"locale":4,"alternates":5,"title":8,"description":9,"h1":10,"lead":11,"breadcrumbs":12,"sections":21,"faq":36,"related":49,"updated":79,"tool":80,"schema":82},"en",{"es":6,"en":7},"\u002Ftemporizador\u002F3-horas","\u002Fen\u002Ftimer\u002F3-hours","3 hours timer ⏱ online with alarm","Free 3 hours timer: press Start and an alarm rings when it ends. Full screen, several sounds and works offline.","3 hours timer","3 hours countdown with alarm.",[13,16,19],{"name":14,"path":15},"Home","\u002Fen",{"name":17,"path":18},"Timer","\u002Fen\u002Ftimer",{"name":20,"path":7},"3 hours",[22,26,32],{"paragraphs":23},[24,25],"This timer is set to 3 hours. That is 10,800 seconds, 180 minutes, 10,800,000 milliseconds. It is 12.5% of a day.","During 3 hours a resting heart beats about 12,600 times and a person walks roughly 14,400 metres at an easy pace.",{"heading":27,"list":28},"What is a 3 hours timer good for?",[29,30,31],"a long exam","roasts and slow cooking","tracking paid parking time",{"heading":33,"paragraphs":34},"How to use it",[35],"Press the space bar or the Start button. When it reaches zero your chosen sound plays; on the main timer page you can add and chain several timers for intervals. Sound and volume settings are saved in your browser.",[37,40,43,46],{"q":38,"a":39},"How many seconds is 3 hours?","3 hours equals 10,800 seconds.",{"q":41,"a":42},"How do I set a 3 hours timer?","Press Start: the time is already set. You can pause it, reset it, change the sound or go full screen.",{"q":44,"a":45},"Will it ring if I switch tabs?","Yes. The timer keeps running in the background and rings when it ends as long as the page stays open; the tab title shows the time left.",{"q":47,"a":48},"Will my screen turn off?","In supported browsers the \"Keep the screen on\" option uses the Wake Lock API to prevent it.",[50,53,56,59,61,64,67,70,73,76],{"label":51,"path":52},"1 hour and 40 minutes timer","\u002Fen\u002Ftimer\u002F100-minutes",{"label":54,"path":55},"2 hours timer","\u002Fen\u002Ftimer\u002F120-minutes",{"label":57,"path":58},"1 hour timer","\u002Fen\u002Ftimer\u002F1-hour",{"label":54,"path":60},"\u002Fen\u002Ftimer\u002F2-hours",{"label":62,"path":63},"4 hours timer","\u002Fen\u002Ftimer\u002F4-hours",{"label":65,"path":66},"5 hours timer","\u002Fen\u002Ftimer\u002F5-hours",{"label":68,"path":69},"6 hours timer","\u002Fen\u002Ftimer\u002F6-hours",{"label":71,"path":72},"7 hours timer","\u002Fen\u002Ftimer\u002F7-hours",{"label":74,"path":75},"All timers","\u002Fen\u002Ftimer\u002Flist",{"label":77,"path":78},"Stopwatch","\u002Fen\u002Fstopwatch","2026-10-23T13:43:25.295Z",{"seconds":81},10800,{"app":83},{"name":10,"category":84},"UtilitiesApplication",1792763005280]