With it being published in the Journal of irreproducible results i assume this is a joke, right? Still, I think the hypothesis is not correct. Time seems to run faster when you are occupied. People get more busy after their 20s so i guess that's why time seems to fly. If i can judge from myself, time seemed to run pretty fast on a 9-6 job (i was there 20-26). Working independently (26- ) has definitely made my days longer, much longer, sometimes irritably so.