I am [currently] very busy.
Well, yes, having a real job is something which takes a lot of energy, despite still being learning, so it fits. I have no idea where this comes from, but it is close to ‘save to take, so I assume that it was derived from “taken” in one of the source languages. It makes sense to imagine an activity which takes a long time to ‘take’ ones time/attention. Or the people of the academy had a bit too much of their alcoholic beverage of their choice.
At least the internet here at the hostel is working again!