Tony Vargas
Legend
Longer 'days' in the sense of more encounters/day, whether you adjust the time required or not, make the major resource-management portion of the game that much more challenging. They stress the classes that are heaviest and most flexible in resources, the ones that high-system-mastery players are going to be overperforming the most with, so if there is a Champion or something in the campaign, it'll be shining a little more, too, FWTW.Rest and recovery are the most straightforward dial to turn and have the most drastic effect.
I've played everything from a Short Rest being 5 minutes to a full night's rest.
I've played long rest takes 1 night's rest and also that it takes a week.
Most sub-classes have either significant short-rest or long-rest recharge mechanics, few have both, so the ratio of short rests to long rests and of each to encounters can affect class balance as well as overall difficulty.