What fraction of a day is $8$hours?

In a day there is $24$ hours

Given hour is $8$hours

Whole$=24$, Part$=8$

We know that

$$\begin{gathered} Fraction=\frac{Part}{Whole} \\ \therefore Fraction=\frac{8}{24} \end{gathered}$$

Hence, The required fraction is $=\frac{8}{24}$