I doubt you'll have any issue with battery drain, though that probably isn't optimal mapping process. You want to start mapping on a motor brought up to temp, which yours wouldn't be on your return trip....
Once you tune the AFM on in computer Menu it will only start mapping when the ignition is on and engine is up to temp.
So when you turn the ignition off the AFM is turned off until you turn ignition back on so to answer your question there will be no battery drain While bike is parked.
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