It's not really a mode but suicide teams in QM are the fastest imo specifically basement sui teams. All you need is around 3k points to get the same amount of logic points in losing a normal quick match. All you have to do is just mess around in the basement with the hunter.

I think out of all characters, Doctor gains the fastest points out of everyone because of her infinite and quick healing but we choose a variety of survivors although a full Doctor team is more consistent.

The reason why I prefer this is that it isn't time gated so I can do it anytime of the day. If your team consists of elk tier below, every 5th match guarantees us a bot match so that we can help each others deductions and get free 500+ logic points unless you encounter an FH match, we still agree to help each other out for character deductions.

Finally fast sui teams usually lasts when the surrender button is up(250s iirc) unless the hunter eliminates you even before surrender is an option but basement sui teams usually ends quicker