How often are basemaps and imagery in the ArcGIS API for JavaScript updated?

[mfcallahan]

Question in title.  I'm wondering how often world basemaps and imagery are updated to include new streets, new labels, new building footprints etc.

[mfcallahan · Accepted solution]

A coworker found this article for me which appears to answer the question:

FAQ: How frequently is the World Imagery basemap updated? 

The World Imagery basemap is not collectively updated. Rather, on occasion, updates occur on the different images within the basemap, and there is no actual known cycle for this activity.