--- description: Retry schedule for custom hostname validation over a seven-day period. title: Backoff schedule image: https://developers.cloudflare.com/og-docs.png --- [Skip to content](#main-content) > Documentation Index > Fetch the complete documentation index at: https://developers.cloudflare.com/cloudflare-for-platforms/llms.txt > Use this file to discover all available pages before exploring further. # Backoff schedule Last updated Jul 16, 2026|Copy as Markdown|[View as Markdown](https://developers.cloudflare.com/cloudflare-for-platforms/cloudflare-for-saas/domain-support/hostname-validation/backoff-schedule/index.md)|[Agent setup](https://developers.cloudflare.com/agent-setup/) After you create a custom hostname, Cloudflare has to [validate that hostname](https://developers.cloudflare.com/cloudflare-for-platforms/cloudflare-for-saas/domain-support/hostname-validation/). Attempts to validate a Custom Hostname are distributed over seven days (a total of 75 retries). At the end of this schedule, if the validation is unsuccessful, the custom hostname will be deleted. The function that determines the next check varies based on the number of attempts: * For the first 10 attempts: ```txt now() + min((floor(60 * pow(1.05, retry_attempt)) * INTERVAL '1 second'), INTERVAL '4 hours') ``` * For the remaining 65 attempts: ```txt now() + min((floor(60 * pow(1.15, retry_attempt)) * INTERVAL '1 second'), INTERVAL '4 hours') ``` The first 10 checks complete within 20 minutes and most checks complete in the first four hours. The check back off is capped to a maximum of four hours to avoid exponential growth. The back off behavior causes larger gaps between check intervals towards the end of the back off schedule: | Retry Attempt | In Seconds | In Minutes | In Hours | | ------------- | ---------- | ---------- | -------- | | 0 | 60 | 1 | 0.016667 | | 1 | 63 | 1.05 | 0.0175 | | 2 | 66 | 1.1 | 0.018333 | | 3 | 69 | 1.15 | 0.019167 | | 4 | 72 | 1.2 | 0.02 | | 5 | 76 | 1.266667 | 0.021111 | | 6 | 80 | 1.333333 | 0.022222 | | 7 | 84 | 1.4 | 0.023333 | | 8 | 88 | 1.466667 | 0.024444 | | 9 | 93 | 1.55 | 0.025833 | | 10 | 242 | 4.033333 | 0.067222 | | 11 | 279 | 4.65 | 0.0775 | | 12 | 321 | 5.35 | 0.089167 | | 13 | 369 | 6.15 | 0.1025 | | 14 | 424 | 7.066667 | 0.117778 | | 15 | 488 | 8.133333 | 0.135556 | | 16 | 561 | 9.35 | 0.155833 | | 17 | 645 | 10.75 | 0.179167 | | 18 | 742 | 12.366667 | 0.206111 | | 19 | 853 | 14.216667 | 0.236944 | | 20 | 981 | 16.35 | 0.2725 | | 21 | 1129 | 18.816667 | 0.313611 | | 22 | 1298 | 21.633333 | 0.360556 | | 23 | 1493 | 24.883333 | 0.414722 | | 24 | 1717 | 28.616667 | 0.476944 | | 25 | 1975 | 32.916667 | 0.548611 | | 26 | 2271 | 37.85 | 0.630833 | | 27 | 2612 | 43.533333 | 0.725556 | | 28 | 3003 | 50.05 | 0.834167 | | 29 | 3454 | 57.566667 | 0.959444 | | 30 | 3972 | 66.2 | 1.103333 | | 31 | 4568 | 76.133333 | 1.268889 | | 32 | 5253 | 87.55 | 1.459167 | | 33 | 6041 | 100.683333 | 1.678056 | | 34 | 6948 | 115.8 | 1.93 | | 35 | 7990 | 133.166667 | 2.219444 | | 36 | 9189 | 153.15 | 2.5525 | | 37 | 10567 | 176.116667 | 2.935278 | | 38 | 12152 | 202.533333 | 3.375556 | | 39 | 13975 | 232.916667 | 3.881944 | | 40 | 14400 | 240 | 4 | | 41 | 14400 | 240 | 4 | | 42 | 14400 | 240 | 4 | | 43 | 14400 | 240 | 4 | | 44 | 14400 | 240 | 4 | | 45 | 14400 | 240 | 4 | | 46 | 14400 | 240 | 4 | | 47 | 14400 | 240 | 4 | | 48 | 14400 | 240 | 4 | | 49 | 14400 | 240 | 4 | | 50 | 14400 | 240 | 4 | | 51 | 14400 | 240 | 4 | | 52 | 14400 | 240 | 4 | | 53 | 14400 | 240 | 4 | | 54 | 14400 | 240 | 4 | | 55 | 14400 | 240 | 4 | | 56 | 14400 | 240 | 4 | | 57 | 14400 | 240 | 4 | | 58 | 14400 | 240 | 4 | | 59 | 14400 | 240 | 4 | | 60 | 14400 | 240 | 4 | | 61 | 14400 | 240 | 4 | | 62 | 14400 | 240 | 4 | | 63 | 14400 | 240 | 4 | | 64 | 14400 | 240 | 4 | | 65 | 14400 | 240 | 4 | | 66 | 14400 | 240 | 4 | | 67 | 14400 | 240 | 4 | | 68 | 14400 | 240 | 4 | | 69 | 14400 | 240 | 4 | | 70 | 14400 | 240 | 4 | | 71 | 14400 | 240 | 4 | | 72 | 14400 | 240 | 4 | | 73 | 14400 | 240 | 4 | | 74 | 14400 | 240 | 4 | | 75 | 14400 | 240 | 4 | Was this helpful? YesNo ## On this page [![](https://developers.cloudflare.com/_astro/logo.te5VL_aD.svg)Docs](https://developers.cloudflare.com/) ```json {"@context":"https://schema.org","@type":"TechArticle","@id":"https://developers.cloudflare.com/cloudflare-for-platforms/cloudflare-for-saas/domain-support/hostname-validation/backoff-schedule/#page","headline":"Backoff schedule ยท Cloudflare for Platforms docs","description":"Retry schedule for custom hostname validation over a seven-day period.","url":"https://developers.cloudflare.com/cloudflare-for-platforms/cloudflare-for-saas/domain-support/hostname-validation/backoff-schedule/","inLanguage":"en","image":"https://developers.cloudflare.com/og-docs.png","dateModified":"2026-07-16","publisher":{"@type":"Organization","name":"Cloudflare","description":"One platform for your apps, agents, and workforce. 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