SetoKaiba mentioned it during a debate on Robotech.com :
"(...)Unfortunately, Macross's creators have never really established how fast (in terms of distance vs time elapsed) a fold jump is.
Likewise, Robotech makes no declarations of how fast fold travel is, but since the depiction of fold travel has changed dramatically of late (from a Macross-style disappearance and reappearance into a generic warp drive effect) whatever definitions may have been previously made probably no longer apply.
If memory serves, the only source to touch on the subject is the Palladium RPG, which is not exactly reliable. I believe they gave "1 light year every six minutes" as the measure of fold velocity. This comes out to ~87,600 times the speed of light, a good deal faster than even the fastest warp drive velocities in Star Trek. It's an unofficial figure.
(...)"
Link : http://www.robotech.com/community/forum/re...3&forumid=9