Fraction of confirmed AGN that are retrieved by selecting an increasing number of visits over a fixed baseline of 3.3 years, which corresponds to the baseline covered in this work, and is the longest sampled timescale for VST-COSMOS data to date. Each point is the average result of 10 random simulations, the error bars being the corresponding thresholds for the 10th and the 90th percentiles. The plot shows that as the number of visits increases, we are able to retrieve a larger fraction of AGN. A denser sampling leads to a reduction in the size of the error bars, as an effect of the reduced differences among the possible patterns that can be chosen for the simulation.