I really don't know. I'm sure in Jeff Brimble's hands it could reach 100ft. Whether this would be a practical or safe option, I don't know. Several of our customers do work with it at 62ft (11 sections) and one at 68ft but this has been done on their own initiative.
About half a mile from my house is a 12 storey block of flats with loads of clear ground around it. One windless day, it would be great to take a whole van-load of sections along and see just how far I could get it! Technically, as long as the top of the pole was propped against the building, nothing should actually give.