If you've invited a client, they receive an immediate email invitation. If they have not responded 24 hours after the initial email, they are sent a reminder email. If they still have not responded 48 hours after the initial email, they are sent a final reminder email.
Any clients you've invited will automatically be added to your monthly blog distribution as a default. This monthly email is released on or very near the 1st of each month. You can change this frequency (How to change the blog frequency) to daily, weekly, or never.
Any invited clients who accept the invite and set up a home maintenance calendar. The clients who have accepted will receive a custom home maintenance reminder based on the characteristics of the home (ie, someone who says they have a pool might receive a pool maintenance reminder in the summer while someone who does not might receive a Pest & Inspect Inspection reminder). This reminder email is sent on or around the 15th of each month.