Well, consider the worst case.

Even if you were to deplete what is left of your pads, it is unlikely that you will not be able to stop.

Stopping power may not be ideal in an emergency, and things may get loud, but it will not be that bad under normal braking circumstances.

Realistically, I would bet you have at least 1000 miles (probably more), depending upon usage patterns.

If there was any chance of not replacing the rotors with your next brake job, this will no longer be possible if the pads are depleted.

I never get more than one set of pads through a rotor anyways, so I would not be concerned about this part.

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1986 300E 5-Speed 240k mi.