I love all of these threads! :)
I've been biking to work for about 4 years, increasing from doing it fairly sporadically to 3-4 days regularly to 5 days/week nearly all the time, all seasons/weather. Plus, since 2 years ago, doing day care drop off & pick up. ~10 miles each way when the roads are good. When it gets icy I take a longer route to avoid dangerous intersections, so can be up to ~13 miles one-way. My best time door-to-door is 32 minutes, including all time waiting at lights/etc., though I don't often time it anymore.
When my son was too little to ride in a seat/trailer (started him at daycare ~5 months, deemed him ready to ride at ~10 months), I'd put him in a wrap, walk 2 miles to day care with him and pulling along the bike. Then I'd bike back past my house and into the office, for ~12.5 miles one-way. These days we use a front-mount bike seat that I leave at day care during the day, for about 30 miles of biking across the whole day of trips.
Most badass would be this past winter, biking on several days with the weather boogey-man warnings about not going outside. I didn't pay that much attention, but I think one of the days was something like -46 with windchill, really bad ice on the road, and slow going that meant I was out there more than an hour each way. Those days I would drive to/from daycare, then come home and hop on the bike to work.
Biking isn't my wife's thing, but she has gotten very good about taking the bus, so most days our car sits lonely & neglected at home.