To find out how long Jeff practiced during the week, you multiply the number of practices by the duration of each practice:
Jeff practiced 3 times, and each practice lasted 1 hour.
So, the total practice time is:
\( 3 , \text{practices} \times 1 , \text{hour per practice} = 3 , \text{hours} \)
Therefore, Jeff practiced for a total of 3 hours during the week.