Distribution of the longest time delay Δt_max for the non-selected lensed quasars and the selected lensed quasars. Top panel: mean values of Δt_max with 1 standard deviation as the error bars from the lensed quasars in each θ_LP bin. Middle panel: number of non-selected lensed quasars, the number of selected lensed quasars, and the number of total mock lenses in each θ_LP bin. Bottom panel: TPR in each θ_LP bin. The sensitivity of the lens search algorithm mainly comes from the separation (θ_LP), not the time delay (Δt_max).