To find out how long Jeff practiced during the week, you can multiply the number of practices by the duration of each practice.
Jeff has practice 3 times, and each practice is \( \frac{3}{4} \) hour long.
So, the total practice time is:
\[ 3 \text{ practices} \times \frac{3}{4} \text{ hour/practice} = \frac{9}{4} \text{ hours} \]
Now, convert \( \frac{9}{4} \) hours into a mixed number:
\[ \frac{9}{4} = 2 \frac{1}{4} \text{ hours} \]
This can also be converted into minutes:
\[ \frac{1}{4} \text{ hour} = 15 \text{ minutes} \quad (\text{since } 60 \text{ minutes} \div 4 = 15) \]
Therefore, the total practice time is:
\[ 2 \text{ hours and } 15 \text{ minutes} \]
In conclusion, Jeff practiced for a total of \( 2 \frac{1}{4} \) hours or \( 2 \) hours and \( 15 \) minutes during the week.