A fast food restaurant wants to offer a guarantee to customers that they will receive a free voucher if they have to wait too long for their meal. For any given meal order, the time it takes for the customer to receive their meal is uniformly distributed between 15 and 37 minutes. The fast food restaurant decides that any customer whose time it takes to receive a meal is among the slowest 29% of all times will receive a free voucher.

What should the fast food restaurant set as the cut-off for the time it takes a customer to receive a meal after which they should receive a free voucher? Do not include any units in your answer. The answer is rounded to four decimal places