i would focus on the fuel pump relay first
it is unlikely the crank sensor would fail in the manner which you describe.
normally when they fail the car won't start irrespective of time. the only other cps failure i have seen and then only once was a short in the wires which caused a stall because of the engine vibration causing the two wires inside the sensor cable to short against each other.
since you describe 1 hour being the trigger i suspect heat is the actual causal factor which returns us to the relay.
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