Another interesting aspect of doing the same duty two days in a row is that I felt a lot more confident about it today. Something similar happened when I did some volunteer work for Crisis a few years back (doing the night shift in one of their homeless shelters over Christmas) - I got pretty fed up on the first night, and I only went back for the second night because I'd already committed to doing three, but it got a lot easier after that. This reminds me of something Peter David has said in the past, about living "in the world" vs "on the world". It's not quite at the same level as Carrot (from the Discworld novels), when he is almost wearing the city, but I certainly felt more involved in things today.
Anyway, shower then bed, so that I can be up for work in the morning. In hindsight, it might have been better to book tomorrow (today) off, but live and learn.