The pre-scission neutron multiplicities have been studied for ^16,18O+^194,198Pt at 50, 61, 71.7, 79 MeV excitation energy populating ^{210,212,214,216}Rn compound nuclei having fissility 0.735, 0.732, 0.729, 0.726 respectively. Fission Time scales were extracted from the measured pre-scission neutron multiplicity and statistical model PACE2. The effect of fissility on fission time scales has been measured. It is found that fission time scales increases in a consistent way with fissility of the compound nuclei (CN) populated. The fission delays extracted for different CN are in good agreement with earlier published data for heavier systems [1, 2]. In the present work it is shown systematically that the fission time scales generally increases with fissility value of CN.