Manuscripts arrive at Gray Wolf Press for review every $28\mathrm{.}9$ days on average with a standard deviation of $36\mathrm{.}2$ days. Manuscripts are reviewed on a first$-$come$-$first$-$serve basis by the first available of one of $4$ editing teams. The time it takes the editing team to review a manuscript is $42\mathrm{.}3$ days on average with a standard deviation of $23$ days.

Calculate the average time in days a manuscript waits to begin the review process.

Carry intermediate calculations to at least $3$ decimal places.

Enter your final answer rounded to one decimal place.