Flamestrike
Legend
The idea that if you have a day with a reasonable number of encounters, you can 'balance' that out by having one with way, way, WAY too many down the road.
Presumably by having the players tap out entirely when a single adventuring day takes 2 months real time to complete and are nothing but combat and you start to forget what having character abilities feels like.
Hyperbole.
Most encounters in 5e are generally over inside of 5 rounds. Seeing as my players are on the clock (they get roughly 6 seconds to declare actions when their turn comes up or they take the Dodge action and their turn ends), combats rarely take more than 20 minutes to resolve.