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They recently raised the rate limit on certificates per domain per week from 5 to 20. https://community.letsencrypt.org/t/rate-limits-for-lets-enc...

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It's also worth pointing out that you can have up to 100 SANs in a certificate, so you can technically issue for up to 20x100 (2000) subdomains per week.

When I hit a rate limit on sub1.example.com, it let me create a certificate with a SAN for sub1.example.com and sub2.example.com

So I think it's actually essentially unlimited, you just can't request the exact same certificate more than 20 times per week

There are separate rate limits for FQDNs and domain names. The former is 5, the latter is 20.

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