My commute is shorter but you can generate a huge variance in TSS depending on your mood, number of traffic lights etc - lots of reds and it becomes an interval training session, lots of greens and you're trying to hold 400 watts for the length of Brixton and then Kennington road.
Compare that to pootling in because you thought it would rain so wore a jacket, which turned out to be a handy effort-brake as any sort of speed would see you China with extreme rapidity.
My commute is shorter but you can generate a huge variance in TSS depending on your mood, number of traffic lights etc - lots of reds and it becomes an interval training session, lots of greens and you're trying to hold 400 watts for the length of Brixton and then Kennington road.
Compare that to pootling in because you thought it would rain so wore a jacket, which turned out to be a handy effort-brake as any sort of speed would see you China with extreme rapidity.