They want to extend the 'length' of the school year. [=to make the school year longer; to lengthen the school year]
I've been/traveled 'the length and breadth of' the canyon, but I still haven't found the caves I'm looking for.
I managed to swim four 'lengths' of the pool. [=to swim from one end of the pool to the other end four times]
(..) You understand? Please, Glen, please. I'm askin' for your help. He's gonna die. There's a -foot length of chain And a winch control Behind the seat of the truck. Go and get it. Thanks, Glen. (..)1993 Free Willy