Probably every 5-7 years given their previous track record. I notice a big difference in 2D versus 3D mode where the 3D Maps in my area are 6 years behind while 2D is far more recent. Obviously 3D and Look Around require far more (manual) processing when updating.I wonder how often Apple will update already existing places? I live in an area with a fair bit of teardown / new construction, and quite a bit of their current maps are out of date.