How do I tell whether a timer setting is a start time or a watering duration?
Quick answer
A start time tells the timer when watering begins; a watering duration, often called run time, tells it how long to water. Irrigation guidance distinguishes these as separate settings, but labels and controls vary by timer. Check the manual for your exact model and compare its instructions with the screen or dial. Don’t decide from the displayed number alone; if the manual is missing, look for the model-specific manual through the manufacturer.
The question, the details, the next step.
My timer shows a time and a number of minutes. How can I tell which setting is when watering starts and which is how long it waters?
Separate the two meanings first: a start time answers “When does watering begin?” A watering duration, also called run time, answers “How long does this watering run?” For irrigation controllers, Colorado State University Extension describes run time as set in minutes and distinguishes it from start times, which schedule when cycles begin. [S1]
That distinction is useful, but it does not identify the controls on your particular faucet timer or controller. Labels and displays are not universal. Find the timer’s brand and model, then check the manual’s setting names and programming instructions. Do not infer the meaning from a number or unit alone.
I don’t have the paper manual. What should I look for before trying to change anything?
Look for the brand and exact model number on the timer itself, its packaging, or any product records you have. Then find that model’s manual through the manufacturer; Utah State University Extension advises consulting the controller manual and says a manufacturer’s website may offer a downloadable copy or ordering information. [S2]
In the manual, search for terms such as “start time,” “start,” “run time,” “duration,” or “watering time.” Treat those as search clues, not proof that your timer uses the same wording. Match the instructions to the exact model and the screen or dial you see. If you cannot verify the model or the instructions do not match the interface, pause rather than guessing.
Can I use the display as a clue while I’m checking the manual? For example, it shows 6:00 and 15.
Yes—as a clue to investigate, not as a conclusion. In a hypothetical example, a manual might identify “6:00 AM” as a start time and “15 minutes” as a zone’s run time. That would mean watering is scheduled to begin at 6:00 AM and run for 15 minutes, if those are the definitions for your exact timer. The example does not establish what your display means.
Use the manual’s diagrams or programming steps to match each displayed field to its name. Check whether it describes one schedule or separate settings for different zones, if your model has zones. The general distinction between a start time and a run time is supported for sprinkler controllers, but the cited guidance does not establish how any specific faucet timer labels or displays them. [S1]
Once I’ve found the manual, what’s a simple way to record what I learned so I don’t mix the settings up later?
Write a short note using the model’s own labels, then verify each meaning against the manual before changing the schedule. For example, this is a copyable placeholder—not a claim about your timer:
Timer model: [brand and model]
Manual label: [exact displayed or printed label]
Meaning: [when watering begins / how long it runs / not yet confirmed]
Manual section or page: [reference]
Verified against display: [yes / no]
If a setting remains unclear, record its exact label and what the screen shows, and contact the manufacturer for help interpreting that model. The available guidance supports consulting model-specific documentation; it does not resolve an unidentified timer’s controls. [S2]
A practical checklist
Identify the timer’s brand and exact model.
Find the manual for that model; use the manufacturer’s site if the paper copy is missing.
Look up the manual’s definitions for start time and run time or duration.
Match the instructions to the timer’s actual display or dial; do not guess from a number alone.
Record the exact label, its verified meaning, and the manual reference.
A few more useful answers
Does a number shown in minutes always mean watering duration?
No. Check the exact timer’s manual and interface. The general irrigation-controller distinction is that run time describes how long a zone waters, but that does not identify an unfamiliar device’s display. [S1]
What if the manual’s instructions do not match the display?
Do not change the setting based on a guess. Recheck the model number and manual, then ask the manufacturer to help identify the control.
Can the general distinction tell me what an unidentified timer means?
No. It explains the difference between a start time and a duration, but the cited guidance does not establish how a particular timer labels or displays those settings. [S1]
Sources
References used for this guide.
- [S1] Operating and Maintaining a Home Irrigation System | Colorado State University Extension extension.colostate.edu · Checked
- [S2] Irrigation System Maintenance | Utah State University Extension extension.usu.edu · Checked