Sensitivity limits as a function of the integration time for given closure phase accuracies per acquisition. These curves have been extrapolated from the accuracies measured on Vega (square at R_mag = 0.1), Deneb (triangle at R_mag = 1.14) and Alf And (cross at R_mag = 2.1). Two curves are drawn per target: the black one is extrapolated from the mean accuracy per acquisition and the gray one from the final best statistical error. The accuracies are given for uncalibrated measurements.