Michael Merzenich, Ph.D. is a pioneer in brain plasticity research and the author of more than 150 peer-reviewed articles. He has received numerous awards and prizes, has nearly 100 patents and has been featured in hundreds of books covering topics such as learning, rehabilitation and plasticity.
There shall not be more than the equivilent of four quarter bends (360 degrees total) between pull points, for example, conduit bodies and boxes. ansi/tia/eia-569-b: 8.8.2.2 Bends
If you have 6 90 degree turns, either put in 3 90's and an access point (if using an LB, that can be the access point) or 4 90's an an access point, depending how the run works out best for placing the access point. Use electrical conduit sweeps, not plumbing 90's or 45's.