leatherface,
I've only been really serious about grip training for about 6 months now, and I still haven't found the ideal placement of grip training time.
I lift 3-4 days a week and usually do some form of grip training about 5 days a week. 3 are usually very specific, sometimes light...and 2 days are very heavy where I do nothing but grip on off days from lifting. Like tomorrow is a grip day. No crushing tomorrow, just pinching and holds. I'll do something like the following....
Thickbar(2") holds 4-5 sets - timed
3" bar holds a couple timed sets
1 handed 25# plate pinches
1 handed 35# plate pinches
2 handed 45# plate pinches
2 handed 45# plate pinches with additional weight(25-45#)
Hub training with about 25#, 30#, 35#
My grip has been progressing very well so far, but I'd still like to find the niche to fit it in with the rest of my training a little better. I'm not willing to sacrifice the other parts of my body for grip, but its become very important to me nonetheless. It took me years to find the right schedule for my body, and I assume it will be a while before I find it for my grip.