I am not using Hubspot. I am using another email verification service (Myemailverifier)
They said our tool takes only 2 sec to verify email with API that means they API's responsive time is only 2 sec.
but I didn't try their API. If Hubspot'S API email verification takes 1 hour or more, it's also good for me. I'll try HubSpot API tool for my email verification
It should be within 24 hours but in most cases I have seen it verified within the hour. Just to be sure are you referring to email sending verification in HubSpot? So adding DNS records to the domain registrar etc.?