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The communication limits are based on a midnight to midnight time period. So, if an email was sent at 10am on Tues, they wouldn't receive anymore emails until 12:01am on Wednesday as stated here: Enable Communication Limits - Marketo Docs - Product Docs
1 of 1 people found this helpful
Key callout is that it is based on the timezone of your instance, not the end user's time.
Per Day is based on the calendar day in the subscription time zone. (midnight-midnight)
Thank you both!