The long jointer at Williamsburg is about 5 or 5 1/2 feet long as you
can see at
https://sites.udel.edu/materialmatters/2017/05/22/barrels-and-buckets-the-
cooperage-at-colonial-williamsburg/


The long jointers (2) at Sutter's Fort State Historic Park are both
approximately 6 feet long, which seems to be the most common size. 
Sadly, demonstrations have been recently abandoned by State Parks, so
they can no longer be seen "in action."  I have demonstrated the one in
the cooper's shop, and there is one in the carpenter's shop.  Currently
they are standing on end and leaning against the walls.  I still
demonstrate coopering (as well as carpentry) at James Marshall Gold
Discovery Site State Historic Park, and occasionally at Fort Ross.  At
Ross I use period appropriate Russian tools.  Russian coopers were
"craftsmen of necessity" using fewer tools than Anglo/American, Spanish,
German and French coopers. 

Yes, it is the stave that is in action. 

Mike in Woodland