Day is a unit of time, there is nothing saying the rate you regenerate energy over a day, is the same as the rate you *use* energy in a day (You don't regain energy as fast as you use it, you're not working a full day)
Energy is consumed differently by surfing and work and has different "consumption rate" than "recovery rate". ATM you get 20 game minutes of work per 1 energy point. This can be definitely displayed and explained better in game. I will add that.
