After successfully relighting your gas water heater's pilot light and turning the control valve back to the "ON" position, it typically takes between 30 to 60 minutes for the main burner to completely reheat the full tank of cold water back to your set operating temperature. The exact recovery duration depends heavily on the gallon capacity of your storage tank and the BTU heating output of the gas burner assembly. Verification: Test the hot water temperature at a nearby sink faucet after waiting 45 minutes.
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