During the halftime of a basketball game, a sling shot launches T-shirts at the crowd. A T-shirt is launched from a height of 6 feet with an initial upward velocity of 68 feet per second. Use the equation h(t)=-16t²+68t+6, where t is time in seconds and h(t) is height. How long will it take the T-shirt to reach its maximum height? What is the maximum height?
The T-shirt takes ___ second (s) to reach its maximum height. (Type an integer or a decimal.)