Tina is bored, very bored. She has decided there is no time like the present to take up a new hobby, paper football creation and flight. She finds some construction paper and is ready to begin. Her goal is to be able to launch a paper football that will land directly in front of her dog in the hopes that she can film its surprised reaction for TikTok.
Being a top algebra student, she models the height h(x), above the ground with the equation, h(x)=-x^2+10x-16, where x is the number of seconds since Tina hits record on her phone.

How many seconds would it take Tina to launch the football after she begins recording?