It is always interesting to read about how near an inventor can get to 'perpetual motion.' Even one that doesn't achieve anything closely approximating spinnig perpeptually.  During those 6 hours this machine runs I am sure it will be unable to do any real work. Perhaps with luck it will keep a single low-wattage light burning.  The second light added will probably stop the process.   The spinning wheels are simply storage devices, mechanical batteries.  Batteries / accumulators are a more fruitful field of research.  It is already happening.