A talk runs long for ordinary reasons. The opening story was longer than you remembered. A slide invited a tangent. You could not see a clock without turning your head, so you guessed, and the guess was kind. The fix is not a more inspiring attitude. It is a rehearsal that measures the real length, and a countdown on the day that spends a budget you already accepted.
TED’s help center states the format the organization recommends: talks of 18 minutes or less, because that window is long enough to say something meaningful and short enough to hold attention. The same page says shorter talks, in the range of 3 to 9 minutes, can be as effective or more so, and that some non-traditional formats, such as a dialogue or an interview, may run longer, up to 30 minutes. That is TED’s recommendation for TED’s stage. It is not a measurement of every audience, and it is not a rule your staff meeting has to follow. It is a useful outside number when nobody has given you a better one. If the organizer gave you 10 minutes, or 15, their number wins.
Clockbeam can hold those lengths. It does not add the extras a dedicated speaker timer sometimes has. There is no warning color at two minutes left, and there is no overtime clock that keeps counting after zero. If you need those, this is not that product. What you have is a countdown you can read, a stopwatch for the rehearsal, and a fullscreen clock if the room needs the time of day rather than the time remaining.
Rehearse with the stopwatch first
Do not set the presentation countdown until you have heard the talk once. Open the stopwatch and press Start at the first word of a full run-through, including the sentences you usually skip when you are “just practicing the middle.” Take a lap at each section if you want to know which part grew. Split is the time since the previous lap. Total is the time from the start. Those two columns tell you whether the introduction or the third example is the part that does not fit.
Export the laps as CSV if you want to look at them beside the slide list. You do not have to. A single total is enough when the question is only “is this an 18 minute talk or a 26 minute talk?”
The stopwatch includes time you spend away from the tab unless you pause. For a rehearsal, leaving the tab visible is the simple path. Pause if you stop to rewrite a sentence and you do not want the rewrite included. Do not pause to hide a section that ran long. The long section is the finding.
When you know the total, edit. Cut until the rehearsal fits inside the slot with a small remainder. A talk that rehearses at 18:00 will not be delivered at 18:00 the first time a person laughs. Leave a minute or two if the slot allows. If the slot is 10 minutes and the rehearsal is 14, the countdown will not save you. The edit will. The 10 minute timer and the 15 minute timer are the right instruments only after the talk can actually live inside them.
On the day, count down the slot you were given
Set the timer to the slot, not to the length you wish you had. Ten and fifteen minutes can open on their own pages. Eighteen minutes, matching TED’s recommended ceiling, is set on the main timer as 18:00. Thirty minutes, if you were genuinely given a half hour or you are in the longer interview format TED mentions, can use the 30 minute timer. Then wait. Press Start on the first word, or when the introducer stops, whichever moment the organizer counts as yours.
Put the timer where you can see it without performing the act of looking. Fullscreen on a laptop beside the slides, or on a second screen turned toward you, is the usual arrangement. The audience does not need to watch your countdown unless you want them to. A room clock is a different choice. The fullscreen clock shows the time of day, large enough for a classroom or a hall. Use it when the instruction is “be done by 2:40” rather than “you have 12 minutes from now.” In that case you are comparing the clock with a written end time, and a countdown only helps if you started it at the right moment.
A label such as “keynote” or “Q&A” keeps two tabs from being confused if you prepared both. The question period, if it has its own budget, is a second countdown you start when the talk ends. Do not let the talk’s timer keep running into the questions and then wonder why the answers felt short.
There is no overtime mode. When the countdown hits zero, it is finished. If you keep speaking, you are spending time the page is no longer tracking. Decide in rehearsal what the last sentence is, and say that sentence when the time is nearly gone. A finish you planned is shorter than a finish you improvise while apologizing.
Sound, fullscreen, and a laptop that wants to sleep
Preview the sound before you walk on. The chime plays only while the tab is open and the device is awake. A browser sleeping behind the slides can miss it. If you are the one who must hear the end, keep that tab alive and the lid open. If a producer is watching the timer for you, they need the tab, not you. The sound is a backup for a number you can already see. Do not depend on a chime the room’s sound system is not playing. The timer’s audio comes from the computer it is running on. It does not route itself into a house mix. The OBS countdown is a different page, for a stream, and that overlay does not play a chime at all.
Fullscreen is a browser permission. If the browser blocks it, the countdown still expands on the page. Press Escape or Exit to leave. Fullscreen does not start the timer. Start does.
Practice the glance. In rehearsal, notice whether you can read the remaining time from where you will stand. If you cannot, move the screen before the audience arrives. A timer you cannot see is a timer you will negotiate with.
Clockbeam will not flash the screen at five minutes and two minutes. If you want those warnings, pick landmarks in the talk instead. “When I see ten minutes left, I am on the second story. When I see five, I am on the ask.” Those landmarks come from the lap times in rehearsal. They are more reliable than a color you might not notice, and they do not require a feature the page does not have.
A small checklist
Cut the talk until a full stopwatch run fits the slot, with a little room. Set a countdown for that slot. Start it on the first word. Keep the tab awake and visible to you. End on the sentence you chose, even if a later slide is still unused. If the organizer’s number and TED’s 18 minutes disagree, follow the organizer. Eighteen is a recommendation from one stage, cited here so you have a concrete short length when the invitation only says “keep it tight.”
Afterward, if you ran over, the stopwatch on a recording will tell you where. The countdown cannot, because it stopped at zero. Next time the laps will show the section to cut. The timer’s job was only to spend the budget in public without guessing.
