What size conduit are you using? I just did two pulls through 120 foot 1/2 inch PVC conduit, feeding two different locations, one straight away and one with two 90 degree bends. I wanted to use 3/4 conduit but drilling a 1-1/4" hole for 3/4 through seven inches of poured concrete takes equipment I don't have. I used a mini Shop Vac, mason twine and a thin plastic bag for the "parachute". It took a little working the line to get past excess glue in the joints, but went fairly easily. I did that working alone and just ran the mason line out so it fed in as easily as I could make it
I did a pull through 300 feet of two inch PVC with two 90 degree bends in it a number of years ago. I used two LARGE Shop Vacs to pull a lead string, mason line, with a thin plastic bag as sort of a "parachute". Ended up with about 200 feet of mason line in one of the Shop Vacs after about 30 seconds of "full power". There was a helper on the feed end, and we had walkie talkies, so it went very smoothly. I suspect that a 600 foot pull, through two inch, would go just as smoothly with two LARGE Shop Vacs.