Which crusade was the shortest?

The shortest crusade was the Fourth Crusade (1202-1204), which deviated from its original goal of recapturing Jerusalem and instead resulted in the conquest of Constantinople. Initially intended to support the Byzantine Empire, the crusaders became embroiled in political conflicts and ultimately sacked the city in 1204. The crusade lasted about two years, but much of that time was spent in negotiations and preparations rather than actual military engagements.