Hi it is discussed in these two Topics
https://community.tablotv.com/t/guide-data-optimizing/21594
and
https://community.tablotv.com/t/can-i-change-the-timing-of-the-daily-optimizing-guide-data/17480
I have a Quad HDMI which after installation I turned off its access to Internet and last night used all of the first two weeks free trial data and had no guide data. Don’t know time as I didn’t make note of time when it chose to optimize.
Was quick as no data to optimize. 
Purchased as it is capable of usage without internet or data once installed with initial internet connection and possibly brief to update channel guide (not sure if then it would actually require brief connection)