Knowledge: Swimming requires 2 years of rigorous training with about 3 hours everyday to become a state level professional. Whereas, scientists say spending 10,000 hours on training will make you efficient at running.

Conversation:
My new obsession is cross country running. I love running out in nature and dirt trails.
Interesting. The courses can pass through several areas like woodlands, hills, or even gravel roads. Are you training for an event?
Yes, but I am not sure about how many hours should I be training everyday to be the best at cross country running?

Response: Well, according to scientists if you train for 10,000 hours you will be efficient at running.