I did mine when I rebuilt my axle. The side that I did all the work on and had recently regreased just needed a couple or so pumps before it popped out the hole on the opposite side, but the other side needed quite a few before I go anything out - didn't count, but I reckon 10+. I'm using 'red and tacky' so I kept pumping until the red stuff came through.
I had the drums off anyway, but nothing came through the seals
No doubt someone will pop along soon and say that I've done it all wrong, but had no problems so far
