Acumen Logs SSL Monitoring reads your certificate on the first check and then checks it about once a day:

• Expiry Reminders: Sent at 45 days and 30 days before expiry, and then on every daily check once 14 days or fewer remain (or on a custom day, week, or month schedule per alert channel).
• Trust & Hostname Alerts: A hostname mismatch or certificate verification failure (expired, self-signed, or untrusted issuer) triggers an immediate alert when detected.

You can also run an instant one-off check anytime with our free SSL certificate checker.