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Sounds to me like your jeep has what's known as the delayed start check engine light problem. Check to see if your check engine light comes on, when you turn on the ignition, at the times when the fuel pump is 'delayed'. If no check engine light comes on then your ecu needs to be repaired or replaced. Both options are available on ebay. The jeep will not start until that check engine light finally coming on.
Look to see if the check engine light come on, on your dashboard, when you turn the ignition on. If that light does not come on, then your ecu computer is in need of repair and your jeep will not start until that light does come on. Alternately, if that light is on, it could be your crank sensor that's bad on the jeep.
Your ecu computer is in need of repair. You have what is known as the Delayed Check Engine Light problem. There are a few components inside the ecu that are slowly failing and eventually will completely fail. The ignition has to be turned on, for a few minutes, and the jeep won't start until the check engine light eventually comes on. This is because the ecu feeds power to the fuel pump and injector relays and won't feed power until that light comes on. Have it repaired.
Your ECU is going bad and needs to either be replaced or repaired. That 'no check engine light for 20-30 minutes' is a common problem that tells it's an ECU problem.The ECU won't power the fuel pump and other relays until the check engine light illuminates on the dash.
Sounds like the ignition switch is going bad and you may need to have the codes read to figure out why the light is coming on to begin with, try Auto Zone , they'll read the codes for free and help you with the replacement parts needed.