A nice surprise

Mark just called me about an hour ago to let me know he was driving home.  Rarely does he get to start his 10 hour drive home before noon, and most commonly it's about 2 or 3 pm.  What a nice surprise!  The only problem is I thought I had all day to get the house cleaned to my "Mark's-homecoming-specifications."  In reality I have about 3.5 hours.  Good thing we have a less than 900 sq ft home!