Recovery time and evidence

Set a deadline for bouncing back, and name the observable fact that proves it happened. How long may the degraded version run before full function must return, and what would someone else be able to check?

Set a deadline for bouncing back, and name the observable fact that proves it happened. How long may the degraded version run before full function must return, and what would someone else be able to check?

Example

For guitar night: after any gap, full sessions resume within one month. The proof is two consecutive in-person nights on the calendar with all four of you playing, not a group text saying you'll get back to it soon.