Well, let me do the math for you, but just a warning: I might throw in a joke or two along the way.
When an object is thrown straight up and another straight down from the same height with the same initial velocity, their total time in the air should be the same. So, if the first object takes 4.0 seconds to hit the ground, we can confidently conclude that the second object will also take...wait for it...4.0 seconds!
It's all about equality in the world of physics, my friend. No object wants to be left behind. They all want to hit the ground and join the gravity party!
So, the second object hits the ground in 4.0 seconds after the first object does. Keep in mind, though, that while they may be late to the landing, they'll always win in the high-flying competition. Up, up, and away!