I asked a similar question but can’t find the thread as was old forum. It was about classing a 5.5 mile bike commute as training.
The general answer was not no bother and still get proper miles in.
I’ve been doing the ride for the past week or so and hitting it pretty hard as an interval session, lots of traffic lights, little bit undulating. I just wondered from those experienced how long you can realistically ride twice a day for 20-25 mins like this (power zone pic below)
Am I likely to crash and burn one day or is it fine to do this 3-4 days a week?