Depends on if you have Cirkus or pre-Cirkus.
Cirkus takes much less oil, only about 10 drops will be plenty. Use a flash light, you'll see that the oil will cover the bearing (a ball).
On non cirkus, when you use the flash light to look inside, you'll see the white nylon sleeve going all the way and stop. There is only a flat disc on the bottom. You want to fill up the gap between the disc to the bottom of the sleeve. One of the previous post like 30-34 drops sounds about right.
Over fill is OK, but with a Cirkus bearing, it will be a pain because you will have spilled the majority of the over filled oil.