It took me like maybe 3 days total, though like I said I was using the Falcon Peak for the normal missions so if you use a Donut Ship from the start it might go faster for you. The EX missions aren't that bad, I was able to S rank most of them on my first try. Just edit your Donut Ship to meet each mission's requirements.
Just exit and reenter the room and it'll respawn.
Man! I've been blindly using the Falcon Peak and now its when I'm seeing things going. I'm actually afraid of the Ex missions. Not cause of the conditions but finding a way to S rank. The Falcon Peak is making things easier now and I'm curious about the blueprints I'm missing.
Roxie: What Precursor said.
How do I beat the boss from the Assault of Dreadnought? I actually upgraded my Teeny Ships for some Comets and I was kicking ass...and this thing still manages to stop me.