10 minutes door to door and it doesn’t matter what time of the day or night it is, really. The big delay coming home would just be getting off campus, but debate practice takes at least an hour after school, so that isn’t an issue.
I guess my average commute is about 30 mins. Traffic can add ~ 10-15 minutes in the evening window as we bump and crawl for about 10 miles. The AM commute might get a little slow for about 3 miles, but it still rolls.
I find that it takes me about the same time in the mornings no matter when I leave. If I’m traveling at times/areas of high traffic density, I’ll take the left lane and keep up w/ the flow over there (which can be 10-15 above posted). However, if it’s a light time/area I prefer to set my cruise at speed limit +5 and roll-it-smooth over in the right lane.
In conclusion, morning delta would net about zero and evening delta about 10 mins.
45 minutes going, an hour coming back, and it would take me about 20 minutes either way without traffic. But it is not so simple, since during commutes I take side roads to get around a jam point on the freeway which I wouldn’t do on the weekend, so the trips are not perfectly comparable.
Most of my jams are from ramps and metering lights actually.
My 7.5 mile commute takes me 35 minutes one way, so 70 minutes each day. If there was no traffic, it would take me 20 minutes one way, so 40 minutes each day. So each week it’s an additional 2.5 hours.
My differential is 42 - 72 minutes. The 15-mile commute takes 18 minutes at 2:00am, and an average of 60 minutes at 5:00pm. Except Thursdays, when for some reason it takes about 90 minutes to get home.
Differential = ~10 minutes
Normal Commute = 35 minutes
Midnight Commute = 25 minutes
One way distance = ~20 miles
My commute on weekends would probably be about the same as weekdays due to recreational traffic and bikers. I commute through a popular destination for weekend activities, thus I thought I would use a middle of the night commute time for my calculation.
Even at the worst traffic time I’m driving the speed limit the whole way and there’s just one traffic light that backs up at rush hour. Say a delta of 3 minutes for an extra cycle of that one light.
30 minutes to work
45 minutes coming home
20 minutes without traffic
Lights out of sync along North Capitol Street can make a big difference.
My commute is car/subway, though I could drive in.
Weekday: 10 minutes to train, 10 minutes on train, 5 minute walk
Weekend: about the same, though with a 10-20 minute wait for the train if I don’t time it right.
Driving:
Weekday: if school’s in session (I work at a university in the downtown part of a city), easily 30-40 minutes
Weekend: 10 minutes, maybe 15 if I hit the lights.
So, when I have to go in on the weekend, I drive. During the week it’s almost always the train though.
Currently a 4-mile commute, about 18 minutes with a 5-minute differential. 2-lane road, no ability to pass. My commute time largely depends on luck with lights and whether I get stuck behind a school bus.
I’m about to move, though. My commute is increasing to 48 miles (one-way), and will take about 45-50 minutes. Most of that is along a proper highway, so I’ll be able to pass. But mostly, the time differential depends on weather conditions. New York gets crazy amounts of snow and ice. During bad road conditions, the drive could take as much as 45 minutes longer. But normally, maybe a 10-minute variance at the most.
I’m on public transit. GMaps and the MBTA schedule estimate ~30 minutes from home to office. In practice, I figure that no matter where I’m going, it’ll take an hour, and I’m almost always right.
My commute would stretch to about 90 minutes or so at 4am on a weekend. T service doesn’t start back up until 5 or so, and I would be hoofing it into Cambridge. 
My commute is 22 miles.
5:00 AM time, about 25 minutes.
When I commute by car, the evening commute (always worse) is about 45 - 50 min.
When I commute by motorcycle, it’s about 35, thanks to lane-splitting and ability to use the carpool lane.
3 hours. Yes, that is correct. 30 minutes each way without my fellow commuters. 2 hours with them. Do. Not. Ask.
As a fellow Bay Arean, I have to know. If for no other reason than to stay the hell away from there.
I’m spoiled. 
No differential because of traffic patterns. I work all over the place but my typical commute is to a small city just south of me, and it’s about 20 miles. No “rush hour” traffic. Depending on the exact job location, that takes me from 20-25 minutes, no matter what day it is.
Bad winter roads and construction might slow things down, but not heavy traffic. The benefit of living in a low-density area with an iffy economy!
10 minutes if no traffic and I hit all green lights, 15 minutes if there’s traffic and red lights.
I am consistently astounded by how much time people spend commuting. Having little or no commute is one of my major factors for a happy life.
10 miles, 20 minutes with no traffic, 18 if all five traffic lights are green.
This afternoon it took an hour and fifteen. Tuesday morning about the same. I could still see the office building after 20 minutes today.
Record for my current commute is almost three hours as a snowstorm was just coming in and 1.5 million people decided to head home at the same time.
But that was nothing compared with the 3:45 it took me once in Atlanta to commute 3.5 miles in a “snowstorm” that totaled less than an inch. Literally ever intersection in the whole north perimeter area was classic gridlock. A guy a couple of cars ahead of me ran out of gas, walked to a gas station, came back with a can, fuels the car, walks back and returns the can, comes back to the car. No one has moved an inch in fifteen, maybe twenty minutes.
I used to live 2.2 miles from work. My place of work moved, I now live 2.1 miles away. It takes me 45 minutes to walk it a bit longer coming home as it’s uphill that way. If I drive it takes 5-10 minutes depending on lights. It might take as much as 15 minutes in rush hour, but if I leave right around 5 I usually just take different side streets which others seem not to use. They have stop signs, but I don’t miss any lights.
Morgan Hill to Mountain View. 101 north.
In my case, it’s more a factor of how I hit the lights than traffic. I’ve made it to work in about 20 minutes with no traffic, and 25-30 during rush hour.
It doesn’t involve any highways, though. Highways are great, but if there’s an accident, you don’t have the option of trying another route. I do have a backup route that runs parallel to my usual one (it used to be my regular route), so if things are bad, I switch over. You can’t do that with limited access.