Based on what I have found about the Google map, I tried to download the entire Google map from Zoom Level 17 to Zoom Level 9. To my surprised, the total size of these pictures is about 123877653 byte; total number of files is 85191. Rough download time was around 10 hours. The average file size is 1.5K.
The general purpose Google map downloader is still under developing, here’s the screen snapshot. Should be done in weeks if I have enough free time 🙂
guidebee 
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