Fury scrakes with a 60s interval, solo as sharpshooter. Managed to get Kevin to red health and then met a fury scrake in my path and got sliced up! Good thing HorzineArena has lots of ammo boxes! I used M14 and crossbow. After that I tried 30 seconds and it was too hard for me. Might be possible with near perfect aim but I ran out of ammo or had a new fury scrake spawned before I killed the previous one. 45 seconds was fairly challenging and I got to wave 10 and died due to a small mistake. I should be able to get further next try.

So what do you guys think is the lowest interval possible to complete?
And what is your personal best?

Fury scrakes, HoE, solo, any non-trivial (so not a perkleveling map with 0 risk) map. Any perk. I imagine zerk being useful since you don't have ammo constraints. At least if you can stomp the scrakes quickly.

Should be much easier with more players since the spawn rate stays the same so let's stick to solo for this discussion. Also wave 1 is really hard with 1 FP and several scrakes since the ammo supply and starting weapons are so weak. But you earn loads of money at least, enough to buy M14 to fight wave 2.