93 Concorde shutdown

i HAVE A 93 cONCORDE AND FOR SOME REASON AFTER ABOUT 15 TO 20 MINUTES OF RUNNING GREAT WILL JUST CUT OUT FOR NO REASON. THEN IT WON'T RUN AGAIN FOR ABOUT 8 HOURS. IT IS NOT JUST THE MOTOR CUTTING OUT, IT'S THE WHOLE CAR, LIGHTS, RADIO, EVERYTHING JUST SHUTS OFF AS IF SOMEONE UNHOOKED THE BATTERY. EVERYTHING WILL COME BACK ON BUT THE CAR WON'T RE-START FOR AROUND 8 HOURS. IF YOU COME BACK 8 HOURS LATER AND GET IN SHE FIRES RIGHT BACK UP AGAIN. ANYONE HAVE ANY SUGGESTIONS?

it could be a faulty ignition switch.

I had the same problem with my 93 chrysler concorde you may need to replace the sensors for the camshaft and the crankshaft, I would replace the cam shaft sensor first it's located at the top front of the engine it extends into the timing cover i say replace this one first because it's usually the one to go bad , the crankshaft sensor is located on the passenger side of the vehicle it's somewhat between the engine block and the trasmissinon housing it extends into the trans housing.
Those two sensor's control the signal to your ignition coils.