How to change the time the playes respawn?

So here is a basic answer for you:

local RespawnTime = 5; -- in seconds

game.Players.CharacterAutoLoads = false -- makes it so the character wont load till called using :LoadCharacter() event

local function PlayerAdded(Player)

    Player.CharacterAdded:Connect(function(Character) -- CharacterAdded event

        local Humanoid = Character:WaitForChild("Humanoid") -- Wanna wait for the humanoid so we don't get errors!

        Humanoid.Died:Connect(function() -- activates when the character dies x.x

            wait(RespawnTime) -- respawn timer!!!

            Player:LoadCharacter() -- after the timer, Load the character!

        end

    end)

    print(Player.Name, "has loaded")    

end

game.Players.PlayerAdded:Connect(PlayerAdded) -- Connect PlayerAdded function