Burnout is clinically understood as a combo of 6 factors—work overload, lack of control, insufficient rewards, breakdown in community, absence of fairness, & value conflicts—and only a fraction of it is under your control. Burnout is a systemic problem, so be kind to yourself and hard on the system.
Hey gang I've had to learn recently that the whole "burning out" thing is real so if you find yourself being panicked every waking second that you're not working on something, despite those seconds being very rare, you should maybe listen to the signals and take an intentional break before you crash