You can set each message in your follow up sequence to be sent anywhere from 0 to 999 days after the previous message
Changing A Message Interval
Hover over the Messages tab and click Follow Up Series.
Click "Settings" for the follow up message you wish to edit.
From the "Follow Up Settings" page, change the interval in the box provided. Once complete, click the "Save Changes" button.
Note: You cannot change the interval for follow up message #1 (the first follow up in the series). It is always sent immediately.