I have a 2 mile commute to school.
1. Bike. Between 6 and 10 minutes, depending on traffic and the wind.
2. Car. Probably 10 minutes on average. I haven't driven it in a long time. Often 8 minutes and often 15 minutes. Traffic can be especially capricious in sprawling cities.
3. Bus. I have never ridden the bus, although I'd guess I could make it in 20 minutes on a good day.

Of course, my time by bike is a sprint. If I'm in a hurry, I'll blow through the 4-way stops with no traffic. However, if any drivers can see me, I stop.