Shouldn't drip at all if shaft not turning. If use conventional flax packing, 1 drip about every 20 seconds with shaft turning at idle. I too use GFO and my packing glands don't drip anymore. If yo.re gland is dripping at rest, tighten until it stops. Run your boat and feel the temp of the packing gland. Shouldn't be too hot to touch. Mine stay pretty cool with GFO packing.