30 minutes or 2:30? Your brain has a preference. So does your customer.
By Angelique Craig, Founder, Indigo Fox Marketing
September 2026
It’s 2 o’clock. Would you rather wait 30 minutes or until 2:30?
They’re exactly the same amount of time, but apparently they don’t feel that way.
Now put that question into a business context. A physician's office can tell you the doctor will see you in 30 minutes or at 2:30. A medical device company can tell a customer that a service technician will arrive within 48 hours or by Thursday. A product can ship in three weeks or ship on October 8. In each case, the amount of time is the same, but the way the consumer experiences it is not.
A new study published in the Journal of Consumer Research tested this phenomenon across eight experiments involving 16,604 participants. The researchers found that relatively short intervals feel longer when they're expressed as a duration, such as “30 minutes,” than when the same interval is expressed using clock times, such as “2:00 to 2:30.” The difference was significant enough to influence consumer decisions.
The reason appears to lie in how our brains represent time. We process “30 minutes” as an amount of time, while 2:00 to 2:30 gives that same amount a beginning and an end on a familiar timeline.
There is one important caveat to note if you're planning to apply this principle to your business: as the time period gets longer, the effect reverses. (So much for a simple rule.) With longer intervals, describing the time as a duration can actually make it feel shorter. The researchers call this time-duration asymmetry.
The researchers don't offer a specific cutoff for when the effect reverses, so this isn't a formula. But here’s a useful framework: for a short wait, an end-time frame can feel shorter than a duration frame. “Your technician will arrive by 2:30” beats “your technician will arrive in 30 minutes.” For a longer stretch, the advantage flips: a duration frame feels shorter than a start-and-end frame. “Installation takes six weeks” beats “installation begins October 1 and will be completed November 12.”
Bottom line: The amount of time isn't the only variable. How you frame that time shapes how the customer experiences it.
Sources
Time-Duration Asymmetries in Consumer Decision-Making | Journal of Consumer Research (2026)