The following table contains information about the inventory management of a stock$-$keeping unit. Using this information, what is the economic time interval for securing an optimal policy for a fixed$-$period system $($FPS$)?$ Assume one year has $52$ weeks.

Inventory Data for Fixed$-$Period System

$\backslash$table$[[$Demand$,20,000$ units per year$],[$Order Cost,$$50$ per order$],[$Inventory$-$Holding Cost,$$0\mathrm{.}5$ per unit per year$],[$Lead Time,$2$ weeks$],[$Standard Deviation in Weekly Demand,$7],[$Service Level,$95$ percent$]]$