And the episodes are one hour long, that's nearly two whole year 24/7 to watch it. It will take you 5 years to watch the 15000 episodes if you do this 8 hours per day everyday. It looks like they release 250 episodes per year, so in those 5 years you'll have an additional 1250 episodes, 156 additional days.
I was just basing it on the total number of episodes rather than the actual runtimes. Watching 5 episodes a day every day of each year it would take a little over 8 years to get through 15000 episodes