What Was I Thinking???

Yesterday, I posted my "TO DO" list for the week.  I said I would spend at least 4 hours on my dissertation proposal.  While I have been working pretty continuously on it for most of the day, I thought I would use a stop watch to measure my "time on task."  That was stupid.  Now, even though I have been working for most of the day I feel like a bum because my measured "time on task" is only 1 hour 49 minutes and 12.9 seconds.  That is less than HALF of what I said I would do!  And yet, my brain feels like a big pile of mush.  How is this possible?  And while I thought I had written about 5 pages it was more like 3 (and that's being generous!).   Will I ever get this thing done?  :-/