From the way they've set this up, it appears to be optimal for investors and pessimal for founders. Anyone else notice the same or disagree? It's in the proof for a particular theorem.
The downside I see is that if you are bad at meeting investors / need to iterate on your pitch, these meetings won't allow you to do that, as they'll be over before you can rethink it. But I think it's generally worth more / faster meetings.
*As another investor pointed out, 20 minute meetings may also be too short. I am not sure what the optimal meeting length should be. 30 minutes might be better. 1 hour is probably too long (you can always schedule a follow up meeting).