The copy of the vacuum diagram that I have is a schematic only. So I can be no help with the length of the lines. The more knowledgeable folks on this board will most definitely help you if they have access to that info.
I don't think that aftermarket vaccum tubing is too expensive. Guesstimate and add a few feet for mistakes, etc. Does anyone make correctly marked lines(color striping)? Or do you have to find NOS ones? Scott
Though my first post on this thread was, as is my usual habit, a smartass one (hey, those of us without knowledge turn to jesting...but, I digress...), I put new vacuum tubing in my whole car during the restoration - but I bought the stuff a little at a time as I got to whatever needed it, and didn't pay attention to the total footage I put in. I bought a color-coded set of the A/C-Heater stuff inside for the factory A/C only because it came with the schematic *hanging head* and had the installation instructions there so I didn't have to try and figure out how to connect everything (all my internal vacuum lines for the a/c and heater were missing when I started on my basketcase-turned-kick-ass-cat.
Sooooo...though I am still of absolutely no help to you, I have to agree with those that have posted and recommended guesstimating and/or just buying a spool (since it seems to need replacement at regular intervals *grrrrr*).
Ain't there ANYONE making good rubber that lasts these days (I mean BESIDES Trojan)