The area that I have not yet understood is the variation in the charging models.
The different charger networks can provide power at different speeds. Tesla still seem to have the edge here.
The different vehicles can absorb power at different speeds.
It would seem to be difficult to say XX will be the charging time as a result. You have to specify both sides of the question in more detail?
The maths do seem to be reasonably consistent from 5-80% of charge.