Tony Vargas
Legend
Nah, if -and, I admit, it's not a tiny if - we assume 5e actually does balance at 8 encounters and 3 short rests, then converting a class from long to short is as simple as dividing it's daily uses by 4.I'm sure you could do it, but I think that it would not only take balancing some abilities returning with a short rest, but also re-writing some or maybe even all such abilities to make them weaker so that novas don't melt the enemy. That's a lot of work.
In the case of a conventional caster, to be safe, round down.