What is the Order of Magnitude of the number of hours he trained?

The Order of Magnitude of a number is a way to express its size in terms of powers of ten. If, for example, he trained for 1,000 hours, the Order of Magnitude would be 10^3. If he trained for 50,000 hours, the Order of Magnitude would be 10^4. To determine the specific Order of Magnitude, you need to know the exact number of hours he trained.