It took me 4 months to build up to it, but I did it. And I was only 1 minute late to work.
Then I was useless for the next 20 minutes as I recovered from feeling like I was going to toss my breakfast smoothie. That last hill by my office is a doozie.
a Perfect Insane 
I am very impressed. Did you have to ride in traffic?
Just a little bit. I mostly take the Lance Armstrong Bikeway and the Zilker Park sidewalk. I did ride home on Barton Springs in traffic, but it’s got a bike lane most of the way.