That's pretty much the fastest I can ever click the Z key. (btw, yeah, it was for each one). I don't want to post this in the "Help me through this part" thread, I don't get that same "OH MY GOD I FINALLY COMPLETED THIS PART" feeling. I'm gonna keep trying(Probably die a few more hundred times). Mother Brain is the hardest boss I've fought so far.
EDIT: Btw, when you save after Mother Brain, after you die, does the timer reset to the beginning. Say you saved at 600 if you die, would it just start at 600, or would it revert back to 2000 something.