To determine how many hours Gavin spent trimming, you'll need the percentage of time he spent on that particular chore, which is typically represented on the circle graph.
Assuming you have that information, you can calculate the time spent on trimming using the following formula:
\[ \text{Hours spent} = \left(\frac{\text{Percentage of time spent on trimming}}{100}\right) \times \text{Total hours spent} \]
For example, if the graph indicates he spent 25% of his time trimming, the calculation would be:
\[ \text{Hours spent} = \left(\frac{25}{100}\right) \times 48 = 12 \text{ hours} \]
If you provide the percentage or part of the graph with the relevant data, I can give you the exact calculation.