The radio should only read "1 hour" if you switch it on without the ignition key in, or you are switching it on before starting the car. Try starting the car first ,then switch the radio on. Don't bother switching off the radio at end of your journey, just remove your car key, then the next time you start the car, the radio should come on itself tuned to the station that was on previously and at the same volume level. IF you have done all this and it's still happening then assume you have no positive connection to the radio( loose connection, broken wire etc.) when car ignition key is on.
VL1500 TONY, July 2009