In my LATEST phase, I feel that character background should be 25 words or less, and the GM's world background should be 500 words or less. The GM may have more information, but all the PLAYERS get is 500 words or less.--oldgeezer, a.k.a. Gronan of Simmerya a.k.a. Mike Mornard a.k.a. Mister I Played In The Original Blackmoor, Greyhawk and Tekumel Campaigns
After all, George Lucas only needed 83 words to introduce players to HIS universe.
93 words if you include
"A long time ago, in a galaxy far, far away..."