How often should a website be checked for uptime?

Check every 1 to 5 minutes. Use 1-minute checks for revenue-critical pages (checkout, login, API) and 5-minute checks for marketing and content pages where slower detection is acceptable.

• 1-minute checks detect outages ~4 minutes faster on average vs 5-minute checks.
• More frequent checks cost more API calls but do not create load — a single HEAD request is <1 KB.
• Below 1 minute rarely helps: DNS TTLs and CDN caching absorb sub-minute blips anyway.
• Combine short intervals with a 2-of-2 confirmation gate to avoid single-region false positives.