When set to missing, your macOS/iOS device will send data to our servers in the following intervals:

For macOS:

Status: every 30 seconds
Location: every 5 minutes
iSight: every 2 minutes
Screenshot: every 1 minute
Packets (Network Data, Keylogs): every 5 minutes

For iOS:

Location: every 3 minutes (or every 10 minutes when not missing)

Packets (Network Data): every 15 minutes (triggered by interaction with a push notification)
iSight: every 15 minutes (triggered by interaction with a push notification)

Related Article: How to set a device to missing?