Converted A/C compressor to Endless Air - Greasing

Have a converted A/C compressor to mimic an endless air compressor.
It was on the vehicle when we bought it. It has the grease nipple fitted.
Have never greased it in about 4 years of ownership. Didn't know the grease nipple was there until I removed the radiator etc to replace the water pump.
Can some tell me how much grease should be pumped in?

Cheers Trevor

I can answer my own question
I had read these instructions on the Endless website before but obviously not comprehended and remembered them fully. Doh...

"Lubrication of Endless Air Compressor
1. For average 4WD use give the compressor three or four pumps of Castrol APX-T Bearing Grease or equivalent when vehicle is serviced"

and what is "For average 4WD use" …. For a weekend use - quite a while I guess

Cheers
Trevor