I tend to agree. I work 12-hour night shifts and last year I commuted by bike most of the time. But I took a break during the horrible weather during December/January and I am finding it a struggle to get back to regular biking. My journey is only 50 minutes each way, but if you add 10-15 minutes dressing/undressing at either end, you have a travel time of about 2.5 hours per day. Add in 8 hours for sleeping, half an hour for breakfast and an hour to eat a meal with the family, and there is nothing left for taking the bins out, cutting the grass, paying bills, or whatever turns up in your life. For this reason I only biked it every other day, which gave me a bit of slack, but it was still quite tough - especially on my wife, who has to eat earlier than she would like to, and only really sees me for an hour a day. (I am on a 4-on, 4-off rota, so of course there are four clear days in between to get caught up with things.) You can do it for a day or two, or even a week or two, but long-term it can be quite punishing.