I've had success building most of my base miles around a 50min commute to work. Depending on your commute, you could do them at whatever intensity you need to accomplish that day (I do a lot of low intensity, with the odd higher intensity day sprinkled in).

If you have a young family, I don't see why you couldn't add this most days. It's such a huge time saver, never mind the training benefit (I'd need to make up those workouts elsewhere)

The other benefit is that your runs are "off the bike" - not immediately, but having 6 or 8 bike workouts through the week means that you also train your legs to run off the bike in the general sense. I've been able to pull my HIM run to within 10 mins of my standalone PB for a HM.