I run at about 270 bpm with triplets. Technically 810 perhaps but everything’s triplets – it’s my fastest steady piano speed – and once I tested my speaking rate.
I did a ramble in 2014 with a prompt “How to solve anything”. I’m not good with this stuff but I would challenge myself and I used it in 2015 adding a track at 90 bpm to see if the 270 bpm held and it does. The gaps in my speech fit in at 90 bpm i think.