I have pulled that many cables free and thru conduit to not as many locations. Setting up that many boxes/reels takes time, as does rigging the lead for offset distance pulls.
For those that havent done it, use as much Clear Glide as you have on hand, and then some. Trying to pull an extra 10' on 3 cables in a bundle of 20+ w/o lube is a giant pita. You absolutely need at least 2 people for this, and radios/cell-phones as walkie-talkies.
Just because you have 40 catx/coax cables doesnt mean you can put a tugger on it or overpull. Typically, the lead attached to the string would be cut off and thrown away, because even with all the K-wire (lube) in the world, you will exceed 25lbs pull force, which is against TDMM recommendations and all mfg warranty that I'm aware of. Failing a certification on free-pulled (not in conduit) wire is the biggest pita in the world because you cant fix it without tearing the building apart. It HAS to be done right the first time.
If all 40 cables are running to 30 locations fairly close to one another, you can discount the pull a bit, but not much, especially if it's one pull and not multiples, like a hotel would have (set up 20-30 boxes/reels at the end of the hall, pull wire until the boxes are empty/too short for the next pull, save short pieces for short pulls, waste <4%).
