Have you ever needed to know how fast a PC falls? Sometimes it’s important to know whether they have time for an action on their turn, or just a reaction (usually, it’s just a reaction). I wrote a brief table based on creature size, using 6-second rounds as the basis.
|Fall in 1 round||Fall per round||Time to fall 1 mile|
|Large||550’||1,500’/r (for 2 r); 2,500/r||3r|
And here’s the same table in metric:
|Fall in 1 round||Fall per round||Time to fall 1 km|
|Large||170m||600m/r (for 2 r); 850m/r||2r|
I make no statements as to the scientific accuracy of the data – I ball-parked a midline weight from the PHB (and, in the case of the large creature, average horse weights), and then rounded to produce pleasing numbers. But I think it’ll do as a decent rule of thumb.
(P.S. I think it’ll be rare that PCs will be flying above the 1-round line. Much more than that and they’re out-of-range for a lot of spells and weapons.)