Gravity Forms: Limit entries by number of times of a certain field value and date

This is possible with my GW Submission Limits. It supports limiting by any number of submissions for almost any time period and can be filtered by field value.

Update

To more specifically address your scenario, here’s a query that will return the entry count for one of your values.

SELECT count( l.id ) FROM wp_rg_lead l
INNER JOIN wp_rg_lead_detail ld on ld.lead_id = l.id
WHERE MONTH( date_created ) = 5 
AND YEAR( date_created ) = YEAR( CURDATE() )
AND ld.field_number = 5
AND ld.value="Hello!"