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Just a few simple questions about magnets:

1) If 2 permanent magnets are placed one on top of the other such that one magnet repels the other and therefore the second magnet levitates and assuming that this is a ideal situation and the magnet is not knocked off its vertical levitating position, how long would the two magnets maintain their magnetic properties? - basically how long would 2 permanent magnets last in a repelling magnetic field without losing its magnetic properties?

2) If a have 2 cylinders like shown in the diagram, with the two cylinders repelling each other... how long would the magnets last?

Thanks... :)

1) If 2 permanent magnets are placed one on top of the other such that one magnet repels the other and therefore the second magnet levitates and assuming that this is a ideal situation and the magnet is not knocked off its vertical levitating position, how long would the two magnets maintain their magnetic properties? - basically how long would 2 permanent magnets last in a repelling magnetic field without losing its magnetic properties?

2) If a have 2 cylinders like shown in the diagram, with the two cylinders repelling each other... how long would the magnets last?

Thanks... :)