I don't remember exactly but I have read it somewhere that 'A person can complete the same work in less time if he has less time, whereas the person who has lot of time without so much to do completes it in much more time.

For instance, whenever I need to type a message, it hardly takes me a few seconds to minutes depending on the length, but when my father (who is retired now) sometimes do it in hours... He writes, transforms, deletes, writes again and do it again and again. I don't know why? Time I think.