Translation of aufwendig

Grammar exercises give the teachers and the students different ideas. We discussed the need for exercises in my previous email, but unfortunately I did not receive any further feedback since then.
In school, I had also learned Latin but it's been more than forty years ago. I grew up in Bern and I had lived there all my life, I had no opportunities to travel. It was not that easy during the war.
Since when have you been learning Spanish? My children are not on Vocabulix, they are too small for it. We have no time for the normal day activities, and we are always on the move with the children.