Task: Question Generation
Input (English): Passage: Speed skating After a successful period around 1900, with Jaap Eden and Coen de Koning as World Champions, Dutch speed skating successes became numerous in the 1960s. Champions Kees Verkerk and Ard Schenk were immensely popular, causing a real speed skating hype in the country. Successes continue up to today, with the likes of Yvonne van Gennip (3 Olympic gold medals in 1988), Rintje Ritsma (4-time World Allround Champion), Jochem Uytdehaage (2 Olympic gold medals in 2002), Marianne Timmer (3 Olympic gold medals in 1998 and 2006), Ireen Wüst (5 Olympic golds in 2006, 2010, 2014, 2018 and 6 World Allround Speed Skating Championships) and Sven Kramer (4 Olympic gold medals in 2010, 2014, 2018 and 9 World Allround Championships). The Dutch speed skaters performance at the 2014 Winter Olympics, where they won 8 out of 12 events, 23 out of 36 medals, including 4 clean sweeps, is the most dominant performance in a single sport in Olympic history. Thialf Stadium in Heerenveen was the second indoor 400m speed skating oval in the world, the first to host an international championship and remains a world-class facility today. Dutch speed skaters have won 77 world single distance championchips (since 1996).
Output (English): How many years were there between the 3 Olympic gold medals won by Marianne Timmer?