Anyone know how to make this regen script turn black for 150 seconds?

local model = game.Workspace.Giant
local message = Instance.new("Message")
      message.Text = "Regenerating "..model.Name
local backup = model:clone()
local regenerating = false

function regenerate()
    --Don't regenerate again if we're already doing it!
    if regenerating then
        return
    end

    regenerating = true
    script.Parent.BrickColor = BrickColor.new("Black")

    model:Destroy()

    -- Display the regen message for 4 seconds
    message.Parent = game.Workspace
    wait(4)
    message.Parent = nil 

    -- Put the copied model back into workspace
    model = backup:clone()
    model.Parent = game.Workspace
    model:makeJoints()

    -- After 30 seconds, allow the model to be regenerated again
    wait(150)
    regenerating = false
    script.Parent.BrickColor = BrickColor.new("Bright purple")
end

--Connect a function that regenerates the model when a player touches the button NEED UR HELP!
script.Parent.Touched:connect(function(hit)
    if hit.Parent:FindFirstChild("Humanoid") then
        regenerate()
    end
end)