Okay I just finished my second week at level 3. I came in a JUST under 5 minutes. I'm a little unsure about moving to level 4 just yet. It's close to time for another rest week, so maybe I'll do another at L3 to check my time again, then do my rest week, then try level 4.
BTW, does anyone know why it always seems like when I'm about to have a breakthrough in time at D3 or sets at D1, my D2 time always gets worse? It doesn't make much sense to me, but it's been a pretty consistent pattern.