How long should the Artist Bio be?

The artist bio should be no less than 4 sentences and no more than 12.
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What should be included in the Bio?

Some possible items to include:
-Name / Nicknames
-Age
-Hometown / Current town
-Influences & Favorites growing up
-Current favorite musicians
-Artists you have worked with
-Accomplishments in your career
-Equipment you use
.....you get the point.