who were all of the prime ministers?
edmund barton, alfred deakin, chris watson, george reid, andrew fisher, joseph cook, billy hughes, stanley bruce, james scullin, joseph lyons, earle page, robert menzies, arthur fadden, john curtin, frank forde, ben chifley, harold holt, john mcewen, john gorton, william mcmahon, gough whitlam, malcolm fraser, bob hawke, paul keating, john howard, kevin rudd, julia gillard, tony abbott
of these, which prime minister was in office the longest?
robert menzies
how many days was robert menzies in office?
6,735 days