In LA, up to 2 hours, covering 26 miles. Spent 2 months doing this. Hard to say which was more frustrating, between the drive and the daily battle for parking.
In NYC, up to 2 hours, covering about 14 miles, including 1 mile of walking (through a park). My Kindle did a lot of work during this 5-week gig.
In Connecticut, up to 1 hour 15 minutes for 72 miles, mostly along the Merritt Parkway. Barring extreme winter weather, the Merritt is one of my favorite drives. I've been doing this for 2 months and will continue for at another 6. While it's a lot of miles, most of them happen at highway speed. Because of the company's daily start/end times, I only experience rush hour congestion for about 7-8 miles, immediately after I leave the office.