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We test the robustness of published time delays for 11 lensed quasars byusing two techniques to measure time shifts in their light curves.  We chose to use two fundamentally different techniques to determine timedelays in gravitationally lensed quasars: a method based on fitting a numericalmodel and another one derived from the minimum dispersion method introduced byPelt and collaborators. To analyse our sample in a homogeneous way and avoidbias caused by the choice of the method used, we apply both methods to 11different lensed systems for which delays have been published: JVAS B0218+357,SBS 0909+523, RX J0911+0551, FBQS J0951+2635, HE 1104-1805, PG 1115+080, JVASB1422+231, SBS 1520+530, CLASS B1600+434, CLASS B1608+656, and HE 2149-2745  Time delays for three double lenses, JVAS B0218+357, HE 1104-1805, and CLASSB1600+434, as well as the quadruply lensed quasar CLASS B1608+656 are confirmedwithin the error bars. We correct the delay for SBS 1520+530. For PG 1115+080and RX J0911+0551, the existence of a second solution on top of the publisheddelay is revealed. The time delays in four systems, SBS 0909+523, FBQSJ0951+2635, JVAS B1422+231, and HE 2149-2745 prove to be less reliable thanpreviously claimed.  If we wish to derive an estimate of H_0 based on time delays ingravitationally lensed quasars, we need to obtain more robust light curves formost of these systems in order to achieve a higher accuracy and robustness onthe time delays.

Time delays for 11 gravitationally lensed quasars revisited