20 hours if you have never pointed a dish before. 2 if you have.

If you don’t have a dish, mounting on a wall, ground pole, or ground mount is preferable to risking your life on a roof and easier for adjusting. Running cables into your home through the attic or basement is actually really easy.

A bigger dish is easier to point. It helps a lot to see where in the sky your targeted satellite lives. Dishpointer on iOS is what I used. Having realtime feedback from your pc while you adjust dish pointing helps a ton (there’s a tool in Blockstream satellite software for this).