But it is possible to make it all on one jump run if the eight way gets out first, because the pilot figures at least 15 to 20 seconds for the first climb out. That brings us back to 60 seconds from first out to last out, and one pass. Now lets talk about separation from other jumpers. First of all, anyone who counts on vertical separation for safety is out of touch with reality. Everyone needs to open in their own column of air.
Horizontal separation is the only guarantee of security.
I repeat, horizontal separation is the only guarantee of safety. Vertical separation is a nice idea but cannot be counted on since a minor loss of awareness or a long snivel will eliminate it instantly. Now, a quick digression about fall rates. Light freestylists doing routine freestyle do not fall significantly faster than a fast falling four way. Small skyboards fall fairly fast, if the rider is standing, but big ones fall very slow - slower than most RW, usually about the same speed as tandems.