Mark Rutte on Tuesday became the Netherlands' longest-serving Prime Minister. Rutte has been in charge for 4,311 days, since he first became PM in October 2010, a day longer than Ruud Lubbers who led the Netherlands in the 1980s and early '90s. The 55-year-old is the second longest-serving elected leader in the 27-nation European Union, trailing only Hungary's Viktor Orban.