Clutch life is generally determined by the depth of the rivet heads. There's a spec in the FSM - probably a "was working fine" spec, and a "you can put it back" spec.
I'd put that disc back in. It doesn't look very worn, as long as it's not warped, and the flywheel and pressure plate don't have excessive marking from heat (and nothing you can feel, running your hand over).
If you know anyone who has air tools, or does body work, have them hit the pressure plate and flywheel with a DA. If you can't find the hot spots with your eyes closed, it's good (for this, anyway).
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