3 hour timer

A free 3 hour timer preset to 3:00:00, with a progress ring and an alarm you can hear across the kitchen. The end time is stored in your browser, so a refresh or an accidental close does not reset it. Also searched as 3 hr timer, three hour timer, 180 minute timer.

A three-hour study session that works

Clock	What to do
0:00 to 0:50	Block 1: hardest material first
0:50 to 1:00	Break: stand up, water, no screens
1:00 to 1:50	Block 2: practice problems or recall
1:50 to 2:00	Break
2:00 to 2:50	Block 3: lighter review or reading
2:50 to 3:00	Write a five-line summary of what you learned

Run this page for the overall limit and a 50 minute timer with Repeat in a second tab for the blocks. The study timer page compares other rhythms.

Three hours in the oven

Three hours is the classic braising window. A three-pound chuck roast at 325°F needs about three hours to turn fork-tender. Short ribs take two and a half to three. Pulled pork is not done at three hours; it usually needs six to eight at 300°F, so use the alarm as a check-in to baste and re-cover. The oven timer page has a wider table.

Parking

Three-hour limits are common in downtown garages and near campuses. Start the timer when you lock the car and set 2:50 rather than 3:00. The parking timer explains how to handle meters that reset.

Keep the tab open

A three-hour countdown outlasts most screen-sleep settings. Leave the tab open, keep the device awake, and tick Notify on desktop. On a phone, the alarm will not sound once the screen locks. Need a different length? Use the 2 hour timer, the 4 hour timer, or type any time into the countdown timer.

Frequently asked questions

How do I split 3 hours into study blocks?

Run the 50 minute timer with Repeat ticked and take ten minutes at each alarm. Three cycles plus a final review fill the three hours.

Does the 3 hour timer work if my laptop sleeps?

No. Sleep stops the alarm. Keep the lid open and set the display to stay on, or use Notify on a desktop browser.

Can I check a braise without stopping the timer?

Yes. The timer keeps running while you open the oven. If the meat needs longer, press Space to pause, click the digits and add time.