Well... i think it would depend heavily upon the person... like... i believe the number of life experiences, the knowledge and wisdom that there is and that one can learn is enormously high, or even infinite. So, i think if someone wished to learn, they would spend millenia and wouldnt have learned everything... but, if after 100 years one (wrongly) supposed that they already has seen/lived everything that was to see/live, then the 100 last years would be only a burden of boredom and tiredness.