How would I make this "Part" go at a slower rate?

while true do
wait(3)
    script.Parent.Position = Vector3.new(script.Parent.Position + Vector3.new(0,0.1,0))
wait(3)
end

Well, to me, it seems as if this code works. But my problem is, everytime it runs once, the brick dissapears, so I'm assuming it's running ultra fast or it's broken. I want it to go slower, like move 1 stud up every 3 seconds but it just dissapears. Is there any better way to type this code or is this broken and is fixable?