Session design (20 / 40 / 60)

Rules that do not change with length

• One constraint per session (mute bounce, outside crossings, downpicking duration, a landing note). Not five.
• Work the constraint with the 1-bar protocol.
• Song time is a loop of the bar that breaks, not a full play-through.
• If form changes, the block is over. Rotate or stop. Speed without tension.

20 minutes

1. 2 min — open-string even 8ths (are you here today?).
2. 12 min — constraint only.
3. 6 min — one riff fragment at floor BPM.

Skip warm-up songs. Twenty minutes cannot afford them.

40 minutes

1. 5 min — check-in + current path stage exit test.
2. 15 min — constraint.
3. 12 min — song fragment.
4. 8 min — one lead constraint (target, pinch, or a three-note cell). Optional if the path stage is still mute/pick.

60 minutes

1. Same as 40, plus 15–20 min on a second fragment or a second constraint after a 2-minute break.
2. Last 5 min: play the fragment once “as music,” no debugging. If it falls apart, you learned where tomorrow starts—do not start a third project.