@vioray 7 was the first number to come to mind. I knew I could probbably make a decent test chamber in under 10 minutes, but 5 would likely not be enough. 7 was somewhere in the middle.
Also, the repulsion gel was the last part of the test I added to the map. Since I was timing myself I didn't have enough time to reposition the dropper.

nice map with fun puzzle. oddly the blue gel is a bit inconsistant with where it lands, had to move my portal slightly a few times but that's not really an issue, just odd
I'm curious though, why seven minutes and not six or eight?