I'm interpreting the "tortoise" comment as slow and steady, not apathetic to the day job.

Personally, I put my creative energy into my 9 to 5 job. Instead of using evenings to start side hustles or to "get ahead" on work, I unwind and get adequate rest. This is so I can be alert and switched on during my regular work hours.

I've found stretching myself thin starts to affect me quickly, and I feel like I'm actually operating at 50% on a permanent basis.