*/15 * * * *. The minute step */15 resolves to 0, 15, 30 and 45 — the four quarter-hour marks. The job fires 96 times per day, four times an hour.View future cron matches in a calendar
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The step operator / in cron means “every Nth value starting from the first valid value”. For the minute field (range 0-59), */15 generates 0, 15, 30, 45. The fifth iteration would be 60, which is out of range, so the cadence resets at the next hour's 0.
That gives you four firings per hour — 4 × 24 = 96 firings per day. Multiply by your platform's per-invocation cost and you have a quick budget estimate.
*/15 * * * * /path/to/script.sh
{
"crons": [
{ "path": "/api/cron/poll", "schedule": "*/15 * * * *" }
]
}cron(*/15 * * * ? *) # or: rate(15 minutes)
spec: schedule: "*/15 * * * *" concurrencyPolicy: Forbid
@Scheduled(cron = "0 */15 * * * *", zone = "UTC")
public void pollEverything() { ... }Spring's cron is 6-field (seconds first), so we add the 0 seconds.
*/15 9-17 * * 1-5 — every 15 minutes during business hours on weekdays.5-59/15 * * * * — every 15 minutes offset by 5 (xx:05, xx:20, xx:35, xx:50).*/15 0-2,4-23 * * * — every 15 minutes except during 03:00 (see the “except at hour” FAQ).*/15 * * * 0,6 — every 15 minutes on weekends only.*/5 * * * * — every 5 minutes (3x as frequent).0 * * * * — every hour (4x less frequent).Every 15 minutes hits a useful tradeoff: 4 firings per hour is enough to feel responsive without flooding your logs or your upstream API. Use it for:
When you need per-minute responsiveness, switch to every 5 minutes or every minute. When per-hour is fine, switch to every hour and save 24x the invocations.
`*/15 * * * *`. The minute field's step `*/15` expands to 0, 15, 30 and 45 — four times an hour, 96 times per day. The other fields are wildcards so it fires every hour, every day.
Yes — both expand to the same set of minutes. The list form is more explicit; the step form is shorter. Use whichever your team prefers; most schedulers normalise them to the same internal representation.
Yes. The four positions (0, 15, 30, 45) are exactly the quarter-hour marks. So `*/15 * * * *` is the canonical 'every quarter hour' cron expression.
`*/15 9-17 * * 1-5`. The hour range `9-17` covers 09:00 through 17:59; the day-of-week range `1-5` is Monday through Friday. The job fires 36 times per weekday (4 times an hour × 9 hours).
Yes — `*/15 * * * *` is supported on every standard cron implementation. Vercel's free Hobby plan caps at once per day; Pro and Enterprise allow tighter schedules. AWS EventBridge accepts `cron(*/15 * * * ? *)`. Kubernetes CronJob, node-cron, Quartz and robfig/cron all handle it natively.
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