Mine depends on if I hit the lights. All green = five minutes; All red = 10 minutes (several long lights); half and half = seven minutes.
My longest commute was 1-hour on country roads (no other way to get there). My shortest was two minutes as I literally lived across from the band hall. I just walked. Strangely, it was the same school. Two minutes my first year, 1-hour my second. We moved because the wife got a job 45-minutes the other direction from where we eventually moved to.