There was so little traffic last night, on the way home, that I was able to actually get an idea of how long it takes without it. From Mt. Eliza to NEC took about 27 minutes, compared with at best 35 minutes in traffic – up to 90 minutes at times. Whole trip, from Mt. Eliza to Preston, took about 54 minutes, compared to at least 75 minutes in traffic.
This was of course not breaking the speed limit the entire way. And I was pretty lucky with the lights, too; only had to stop a couple of times the whole trip.