When do Google Maps take the satellite pictures?

Once or Twice a year.

Answer #2

google doesn't take satellite pictures. google purchases satellite imagery from a variety of providers such as DigitalGlobe and GeoEye. Much of google's imagery actually comes from aerial Photography mostly in airplanes with special high resolution cameras. google make bulk updates to google Earth and google Maps imagery usually every 60 days but not all areas are updated on each update.