Fill your downtime with work to fill your pipeline.

Unless you plan on selling freelancing services related to anti-surveillance work (Security, building an audience in the area) really filling your time with anything but sales is going to hurt in a years time

If what you do during your downtime is directly related to your work then it can hardly be called downtime, now can it?

I assumed with the reference to starting freelancing (s)he referred to "time I normally would have spent at work but now cannot bill (i.e. 9-5 M-F) as opposed to "time that never used to be work (i.e. Sleeping, weekends etc)"

Otherwise the freelancing comment would have been superfluous

But you read it how you like.