Consider the following diagram:

This diagram represents a parallel process which includes the $NCx=10,$ a known bottleneck at the Bearington Plant. Here is a table showing setup times and process times at each station:

$\backslash$table$[[$Step$,$Setup Time,$\backslash$table$[[$Process Time Per$],[$Unit$]]],[$A$,1$ minutes,$\backslash$table$[[2$ minutes per$],[$unit$]]],[$B$,2$ minutes,$\backslash$table$[[4$ minutes per$],[$unit$]]],[$C$,2$ minutes,$\backslash$table$[[1$ minutes per$],[$unit$]]],[$D$,2$ minutes,$\backslash$table$[[10$ minutes per$],[$unit$]]],[$E$,1$ minutes,$\backslash$table$[[4$ minutes per$],[$unit$]]]]$

If the standard batch size is $54,$ how many minutes does lead time decrease by cutting the batch size in half? $($NOTE: Please round down to the nearest whole