One by one verification
Email addresses are verified one by one and you can see their status in the corresponding column instantly if your list holds up to 300 contacts. The process is quick and takes 5 mins maximum.
Batch verification
For lists below 300 contacts, the data is verified in the background within 30 mins. The results will be displayed in the Batch tab in the sidebar. The maximum capacity for the bulk validation process is 230,000 contacts at a time.