Depending on the condition of the oven, it could take up to 4 hours.
A couple things to remember is: (1) Make sure you do not turn the light on inside the oven. The clean cycle should disable it. (2) Lock the door if it does not lock itself. (3) Do not open the door during the clean cycle.
Remember the self cleaning temperature is
extremely high. Do not allow children in the area while doing it.
Here is a link for your stove:
GE JTP18 Manual
Directions are on page 23.
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