Our instructions were to follow him for eight hours to see where he went.

The animals must be followed, through hilly country, for 15 hours at a stretch.

I have, in consequence, kept no account of what followed for many hours.

They followed the canal for more than two hours.

I follow a man for eight to 10 hours, sometimes longer.

He followed Adrian for three hours through the acid streets.

They had been following it now for almost four hours.

"I followed him for many hours in the darkness," said Volemak.

The researchers followed individual bears for 24 hours in the fall to study their foraging habits.