Sounds like you've found something that works for you Daimere.
Certainly i agree that no one should do a full water fast on a work day. You just need more energy than you will have available. The other day i found that by about mid afternoon, i was feel a fatigued and brain dead. I couldn't face any tasks that required effort.
So my fast days will be taking it easy days but doing enough to keep boredom from threatening to make me break my fast.