I'm pretty sure it's the shortest super UNLESS you're chaining kills, and even that doesn't provide much energy compared to PvE, maybe +1 second per kill in pvp? The only time the duration will probably ever be an issue is when the spawns are screwing you over because Bungie refuses to implement spawn invincibility even if the spawns get as bad as they were in Rumble during FOTL. I'm sorry, but if I get spawn killed 17 times in a row, 3 of them to the same super, 8 because it kept spawning me in the same place I just died in, and the rest surrounded by people shooting me before I even take 5 steps? Yeah no, any other game with spawns that bad would either have spawn invincibility, damage reflection, or would start banning people left and right because the frequency alone would easily write it off as "spawn manipulation" which is considered cheating/ exploitation (depending on how it happened).