Laboratory experiments were conducted to determine the influence of mating duration lengths on the fitness of Trichogramma evanescence females reared on Sitotroga cerealella (Oliv.) eggs. Different mating duration lengths were counted, then, the mated females were released on to fresh S. cerealella eggs to compare their fitness components after the different mating duration lengths. Fecundity, offspring emergence percentage, produced female's ratio in progeny, longevity and the general productivity were investigated. Counted mating duration lengths were: 8, 10, 13 and 35 seconds. The least mating length was 8 seconds; while the longest counted one was 35 seconds. Trichogramma females mated for 35 seconds parasitized the highest numbers of the offered host eggs; they produced the highest rates of individuals comprising the highest female's percentage. Generally, the highest calculated productivity for the produced females averaged 41.81 females/ female was produced from females mated for 35 seconds, while it was reduced to 18.52 females/ female when females mated for 8 seconds.