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It shouldn't - Cloudflare keeps the TTL for their cache-enabled records very low (like 300 seconds).

If you just log in to Cloudflare and click the "orange cloud" icon on the DNS tab, which points the domain back directly to your origin, you'll see the site up within a couple minutes.

Is 300 very low? I've occasionally seen 60 in the wild.

It's very low compared to 24 hours, which is what used to be the most common setting and that (among other factors) was a big part of the "DNS propagation takes forever" mentality

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