The employee is paid \(\$\)24 per hour for the first 40 hours, so the earnings for these 40 hours are:
\[
40 \times 24 = 960.
\]
The total earnings are \(\$\)1,260, so the remaining earnings come from the additional hours worked:
\[
1260 - 960 = 300.
\]
The rate for the additional hours is 1.5 times the normal rate, or:
\[
1.5 \times 24 = 36 \text{ dollars per hour}.
\]
Let the number of additional hours worked be \( h \). The earnings from these hours are:
\[
h \times 36 = 300.
\]
Now, solve for \( h \):
\[
h = \frac{300}{36} = 8.33.
\]
Therefore, the total number of hours worked is:
\[
40 + 8.33 = 48 \text{ hours}.
\]
Thus, the employee worked a total of \( \boxed{48} \) hours.