It also means that, again if one goes by the design paradigm of 6-8 encounters per day (let's say 7, for simplicity), you're going to earn a level approximately every other in-game day - meaning that in the setting you could go from 1-20 in less than a month and a half if you don't take any downtime.
PC1: "I am glad I killed my first dragon. It's really an achievement in the life of a hero"
PC2: "Time to reflect on the path we've have travelled!"
PC1: "Yeah, remember when we were rookie, afraid of fighting a pair of goblins? Or the time we nearly fainted seeing a skeleton?"
PC2: "Yeah, I remember, it was last Thursday!"