I would say it depends on the equipment you are using to pull. If using a tugger, Id say at least 6 men for a pull that long. 2 on tugger end, 4 men feeding. Reels of bigger wire can be a pain to get going smoothly, and can take some adjusting to avoid running off the jackstands etc. Loading the wire onto the jacks may warrant a forklift or similar, 500 mcm is roughly 1.5 pounds per foot depending on insulation. Unless you have machine adjusted reels.
You will want atleast 1 person standing right at the pipe feeding the wire in at the proper angle, preferably another man to gracefully feed the wire to the man at the pipe. Then at least 2 people working the reels. I like to use electric feeders on long pulls, and you may be able to get away with 4 or 5 men. But with a pull of that length and size wire its better to heir on the side of caution, it cant hurt to have an extra man. Sometimes on longer pulls I have one man on each end solely to work radios in the event of any issues. Again this can depend on the pulling equipment on hand, pulleys etc, and the layout of the equipment your pulling into and what kind of tail off you might need (eg. You need extra 15ft pulled out at the equipment for terminations).
