What is the maximum span for an 8 foot tall privacy fence using 4 x 6 treated lumber post for 90 mph wind load?

It sounds good, but if I was you, I would not use panels, as this will put allot of stress on the post in a light breeze, the force of the wind is greater on enclosed panels, there are allot of people in my area that use 4x6ft panels and even if we get gusts of wind over 10mph, it reeks havoc with the panels and they need to be replaced.