A flat surface of a $\text{C}60$ steel having dimensions of $100 \mathrm{~mm}$ (length) $\times 200 \mathrm{~mm}$ (width) is produced by a $\text{HSS}$ slab mill cutter. The $8$ -toothed cutter has $100 \mathrm{~mm}$ diameter and $200 \mathrm{~mm}$ width. The feed per tooth is $0.1 \mathrm{~mm}$, cutting velocity is $20$ $\mathrm{m} / \mathrm{min}$ and depth of cut is $2 \mathrm{~mm}$. The machining time required to remove the entire stock is ________ minutes (rounded off to $2$ decimal places).
