The "offical" stake count is 12 - 2 off each end, 2 "pull-outs" at each end, 2 at the ends of the pole, and 2 on the pole sleeve.
I get by with 10 by doubling up the lines at the ends.
For "high winds" there have been a number of mods posted by folks adding lines to the "pole cover". I've never felt need for them. Site selection, even in a treeless alpine area, will trump additional lines, IMHO.