Your calculations are pretty fast and loose and involve heavy-weight assumptions. I don’t look at the keyboard to type with two fingers (and my thumb, technica

Your calculations are pretty fast and loose and involve heavy-weight assumptions. I don’t look at the keyboard to type with two fingers (and my thumb, technically). I can probably sustain 120 effortlessly. 130-140 if I’m comfortable. I’ve been doing it for nearly two decades and haven’t had a problem.