[ahtihn]

> If learning durations were log-normally distributed, how would people be able to graduate from universities and finish studies, mostly in time?

If you took a hundred 5 year olds and set the objective to achieve the same PhD in the same field with unlimited time, guess how the time to achieve it would be distributed?

I'm sure some won't achieve it in their lifetime, so I disagree that there's a reasonable upper bound.