$(1$ point$)$ A cashier at the Hungry Bear Restaurant in Disneyland's Critter Country serves an average of $42\mathrm{.}5$ customers per hour $($believed to follow a Poisson distribution$).$ Always conscious of managing park guests' waiting line experience, the disney operations research team wants to post a sign telling customers about the restaurant's efficiency. If the manager wants to be $93\%$ sure she doesn't overestimate, what time should she list?