Taça Intermunicipal 3H Resistência BTT - Monsanto is a three-hour mountain bike endurance race based in Monsanto, in the Benfica area of Lisbon. It is listed as a Sunday morning race, with the start at 09:00, and the format is simple: riders race for three hours rather than covering one fixed point-to-point distance. The event also separates eBikes from the standard three-hour category, so assisted bikes are part of the programme without being mixed into the main classification.
The published page does not give a detailed lap map, but the Monsanto setting points to off-road racing inside Lisbon’s large forest park rather than a road ride. The field is small on the current entry list, with 24 confirmed riders: 15 in the main three-hour race, 2 on eBikes, and the rest spread across youth categories from Infantis down to Pupilos. Entry fees are modest, with lower prices for junior and youth races, which makes this look more like a local cup round for club riders and young racers than a mass-participation festival.