100 seconds
100 seconds equals one minute forty seconds, or 100 s, or PT1M40S. It is a short duration. It is not 1:00, and it is not a hundred on a digital clock.
Guides — how to use clocks, alarms and time zones
Long reads about time: alarms, sleep, time zones, daylight saving and counting days.
This is the index of every guide on this site: short, practical instructions for our clocks, timers, countdowns, and the word counter. Pick the tool you need below, and its guide will walk you through it in a few minutes.
236 guides in “Hours and minutes”.
120 minutes in hour
120 minutes is 2 hours, because one hour holds 60 minutes. Write it as 2:00 or as two hours; it is not 120 hours.
13 hour cast
A 13 hour cast writes thirteen hours as a label in front of the word cast. Most people who type it want the actors in the film 13 Hours. The number is a duration, not a clock time.
14 hour ago
Fourteen hours ago is the instant 14 hours before now. An hour ago calculator subtracts that span from the current clock, in the same time zone, and shows the earlier timestamp.
150 min to hour
150 minutes equals 2 hours and 30 minutes, or 2.5 hours in decimal form. Divide minutes by 60 for decimal hours; for an hours-and-minutes format, use the quotient as hours and the remainder as minutes
1ms to seconds
One millisecond equals 0.001 seconds. To convert milliseconds to seconds, divide the millisecond value by 1,000.
2 hour delay
A 2 hour delay means the event is two hours later than planned: 120 minutes, often written 2h, +2:00, or a two-hour delay when the phrase is an adjective.
24 hour booking
A 24 hour booking is a reservation that lasts one full day, counted as twenty-four hours from a start time. A 72-hour booking is the same idea stretched across three of those days.
24 hour grocery store
A 24 hour grocery store sells food through the night on ordinary days. Named holidays often shorten or stop that night; the phrase is a nightly board, not a vow for Christmas.
24 hour laundry
24 hour laundry means a laundry that stays open through all 24 clock hours. The phrase is an opening format, not a wash cycle that lasts a full day.
24 hours to live
24 hours to live names a remaining span of 24 hours: 1,440 minutes, or 86,400 seconds still on the clock. It is a countdown, not a time of day.
24 hrs how many seconds
24 hours is 86,400 seconds: 24 × 60 × 60. That conversion is how many seconds on a day when the day is exactly 24 hours, and it is the usual hrs to seconds figure for 24 hrs to seconds.
30 seconds or less cast
A 30 seconds or less cast is a short timed act: half a minute at most. Write it 0:30, 30 s, or PT30S. In tabletop rounds of six seconds, that window is five rounds or fewer.
4 hour marathon pace
A 4 hour marathon pace is an even split of the official marathon — 42.195 km, or 26 miles 385 yards — in four hours: about 5:41 per kilometre, or about 9:09 per mile.
5 dinners 1 hour
5 dinners 1 hour is a meal-prep format: you assemble five dinners in about one hour, then cook them on later nights. The hour is prep time, not five meals eaten at once.
5 hour course
A 5 hour course lasts five hours of scheduled time: 300 minutes, or 18,000 seconds. It is a duration, not 5:00 on a clock face.
5 hour drink
A 5 hour drink, in the usual search, is a 5-hour ENERGY shot: a small bottle whose name is a five-hour duration. Follow the label on the bottle you actually hold.
5 hour energy
5 hour energy commonly refers to a small-format energy shot sold under the 5-hour Energy name. It contains caffeine, so read the exact product label, consider other caffeine consumed that day, and do
50 minutes in decimal form
50 minutes in decimal form is 0.833… hours, which is 50 ÷ 60, or 5/6 of an hour. It is also 50.0 minutes if the unit is already minutes.
72 hour fast
A 72 hour fast is three days without food, counted as 72 elapsed hours. 24, 36, 48, and 16 hour fasts are the same idea at shorter lengths.
8 minute abs
8 Minute Abs is a short floor circuit of crunch-style moves meant to fill about eight minutes. It trains the core. It is not a full sport session and it does not replace meals.
90 minute in hour
90 minutes is 1.5 hours, or one hour and thirty minutes. There are 60 minutes in one hour, so divide 90 by 60.
Aaa hours
AAA hours vary by branch and service. Check the selected office’s current listing before visiting, and use the roadside-assistance contact shown with your membership when help is needed outside ordina
Abc store hours
ABC store hours cannot be determined from the name alone because “ABC store” can refer to different retailers or government-operated beverage outlets. Identify the business, jurisdiction, and branch,
How to use All guides
Scan the list and open the page that matches your task. Every guide follows the same shape: what the tool does, how to start it, what the controls mean, and a short FAQ built from questions readers actually send. None of the tools require an account or an installation — each one runs in an ordinary browser tab, and its guide points out the two or three things worth knowing before you press the first button.
Guides for the word counter and other writing tools
The most visited guide here explains the online word counter: paste a draft, read the totals, and see whether your essay, ad, or post fits its limit. If you write to a length requirement — school assignments, application letters, meta descriptions — start there. The guide also covers the habits that make counting useful, like checking the total before you trim rather than after, so you know exactly how much has to go instead of cutting blind.
Guides for clocks, timers, and countdowns
Most of the collection deals with time. There are guides for the stopwatch, the tally counter, the holiday countdown pages, and two longer reads that explain how time zones and daylight saving actually work. The explainers pair well with the live tools: read the theory once, then lean on the map and the converter whenever a meeting crosses an ocean. If you only ever open one, make it the daylight saving guide the week before the clocks change.
Stopwatch and timer basics — measuring up versus counting down Countdowns to Halloween, New Year, and other dates people wait for Time zones explained, and what daylight saving does to them Small tools: tally counter, coin flip, password generator, widgets
How the guides are written
Long manuals get skimmed; short ones get read. So each guide answers the main question in its first paragraph and keeps the details for people who scroll. If a page leaves your question unanswered, that is a defect by our own definition — the FAQ sections grow out of exactly those gaps, one reader at a time. A good guide is like a good referee: when it does its job, nobody remembers it was there.
Questions and answers
- Are the tools behind these guides free?
- Yes, all of them — including the free word counter, the stopwatch, and every countdown page. There is no premium tier hiding behind a button, and no sign-up gate in front of anything.
- Do I have to read a guide before using a tool?
- No. The tools are meant to be self-explanatory. The guides exist for the edge cases: the option you did not notice, the question that comes up halfway through the job.
- Where do new guides appear?
- On this page. When a tool or a longer explainer is added, its guide is listed here, so this index is always the complete picture of what the site can teach you.