Depends on your location. If you live close to a large body of water or in very dust areas, you'll want to do it at least once a year. If you live in the suburbs, once every two or three will suffice.
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It's most often denoted as the "outside".
Interior is inside. Exterior is outside. If I comment on how "The interior space of the house is warm and inviting", I'm talking about how the inside of your house feels and looks.
yes they can if you do not shower or wash them often
Look on This Old House web site. Norm describes the process.
Impossible to gauge from that measurement. You need an exterior figure of wall area, excluding windows.