In a between-lab study, a constant and steady shift was found in hypnotizability scores measured with standard scales. To investigate a time effect in a Hungarian (within-lab) sample, 613 subjects' scores on Stanford Hypnotic Susceptibility Scale, Forms A and B, 1898 subjects' self-scores, and 1713 subjects' observer-scores on the Harvard Group Scale of Hypnotic Susceptibility were analyzed. From the 1970s to 2010, a significant increase was observed in the SHSS:A and B scores of female subjects and the HGSHS:A scores of both genders. Females proved to be significantly more hypnotizable than males in a group setting but not in an individual context. Time and gender did not interact. The possible reasons for these effects on hypnotizability and the role of the testing context are discussed.