grumble grumble grumble →
Apparently I have peaked out at two hours of concentrated productive activity, and that on only three days each week. To be totally honest, the last 20 minutes would be barely adequate in an actual workplace. I can't count my time at the gym because those activities are completely mindless, and that is what got me back up to this current level. Returning to an actual career seems beyond my horizon.
What I must reconcile now is how to make the most of those six hours. I have been composing music but the results are falling short of my expectations.