Ill say the inevitable here...You need to search. This topic has been covered a lot and there are many methods to winter storage.
To answer your question about once a week run time, it's generally stated that you need to get the engine up to operating temperature and take it on a good run or you don't start it period. This generally takes about 20-25 minutes. I'm gonna guess there's no way you'd be able to do much more than idle it in a garage.
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