Don't get me wrong, I'm a big fan of writing stuff out. Just 2 weeks ago I wrote 6 pages full, front and back, spread out over a few days, mainly just reinventing parts of statistics because I wanted to really understand it by doing it myself. Only lateron did I start to use a math program to quickly help people with their problems on 2+2. And last week to help some guy on 2+2 I spent ~3 hours studying up on standard deviations and confidence intervals and the like.

I'm a bit weird like that, but it's also an investment in my carreer as all of this is very relevant to me (project engineer etc).