A man dressed in a surfing shirt and blue and white shorts skillfully guides his yellow board with its multicolored sail over the crest of an ocean wave, flipping over in the process.
a man has surfed for an hour
There's no way of knowing that the surfer has been surfing for an hour.
There is no way to determine how long the man dressed in surfing shirt and blue and white shorts has surfed for an hour.
No way to know that he has surfed for an hour.