A fair bit to go yet. There may be longer runs, but Derby County going 32 games without a win in the 2007-08 season springs to mind. Billy Davies was in charge at the start of that, but Paul Jewell was in charge for the latter 27 of them (24 league and 3 cup games), and then lost the first game of the next season for a total run of 28. They did win their second game, though.