Amazon SES - Domain Verification - Does it expire?

I read the doc about verifying domains in Amazon SES and I don't understand - how long does the domain verification last and does it expire? What happens if I remove the DNS settings after I verified a domain? I tried to do it with the DKIM DNS settings, and there I received a notification that the DKIM of the domain will be revoked, unless I restore them. But with the domain itself, I removed the DNS settings and I didn't receive any notification.

Based on this info you should leave the txt record in place: https://docs.aws.amazon.com/ses/latest/DeveloperGuide/verified-domain-revocation.html

Else after the next check by AWS they will revoke the verification. They will warn you about the pending recovation though and give you 72 hours to react.