In a plate freezer, the plate temperature is maintained at $-25^{\circ} \mathrm{C}$. Latent heat of crystallization is $335 \mathrm{~kJ} \mathrm{~kg}^{-1}$, and the thermal conductivity and density of frozen meat are $1.25 \mathrm{~W} \mathrm{~m}^{-1} \mathrm{~K}^{-1}$ and $1060 \mathrm{~kg} \mathrm{~m}^{-3}$, respectively. Assuming freezing point of deboned meat at $85 \%$ water content on wet basis to be $0{ }^{\circ} \mathrm{C}$, the freezing time in minutes for $2 \mathrm{~cm}$ thick block of meat, kept between a pair of freezing plates, is______________
In a plate freezer, the plate temperature is maintained at $-25^{\circ} \mathrm{C}$. Latent heat of crystallization is $335 \mathrm{~kJ} \mathrm{~kg}^{-1}$, and the thermal conductivity and density of frozen meat are $1.25 \mathrm{~W} \mathrm{~m}^{-1} \mathrm{~K}^{-1}$ and $1060 \mathrm{~kg} \mathrm{~m}^{-3}$, respectively. Assuming freezing point of deboned meat at $85 \%$ water content on wet basis to be $0{ }^{\circ} \mathrm{C}$, the freezing time in minutes for $2 \mathrm{~cm}$ thick block of meat, kept between a pair of freezing plates, is______________