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Nitrogen is better, but I wouldn't say compressed air puts a lot of moisture in the system. It mainly depends on the condition of your air tank. I drain mine. Sure, some gets in there, but it also gets boiled off when under vacuum. Overnight is pretty liberal, but it's all dependent on the ambient temp and how well your vacuum pump works. Mine works pretty well, it's 100 degrees here and 20 minutes is more than enough.
My vacuum pump came out of a Robinaire machine, vintage '07. One fitting and wire it up!
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83 944
91 FJ80
84 Ram Charger (now gone)
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