The average Brit will spend around 15 hours over the Christmas period watching TV shows on their mobile device, research by Vodafone has found. Carried out in December, the study into the behaviour of 4,340 UK residents found that 40 per cent expect to watch between one and three hours of content on their mobile device each day over the Christmas period. According to the research, 24 is the show most likely to be watched over the Christmas period, An Idiot Abroad and Mad Men also made the 'want-to-watch' list.