[Insane Reefer]

Ok, Lowfi, here you go - hope this is what you were asking for.

Cure = hydration and hardening of cement or concrete.
Kure = any process that renders rock with a safe pH, typically accomplished with water baths.

For "by the book" curing of rock, leave the rock in a warm, damp place for 7-28 days. The longer you leave it alone the more able it will be to withstand chemical attacks. Then proceed with the kure.
For Steam curing, around 18 hours is the target time for the block industry to produce "mature" blocks, though the actual steam portion is generally only 4-12 hours - this depends on several variables. Once cooled, kuring can commence.

Kuring takes as long as it takes. Traditionally, rock goes into a bath of water and water changes occur as the pH of the kure solution rises above 11 or 12 - this will be frequent in the beginning and tapering off as the calcium hydroxide is leeched out.

If your rock is fully cured (either steamed, properly cured through age or by chemical admixture), the kure can be sped with a very weak acid bath (no more than 1/4 cup vinegar to 1 gallon of water), which will pull the calcium hydroxide out into solution faster, but again, the potential for damage is an issue.

However you kure your rock, keep a few things in mind.

Never use excessive heat on rock - anything over 160° is considered excessive. After reading and reading, I can say with confidence that boiling rock is about the worst thing you can do to it. You can heat the kure solution to no more then 160°F, and this will speed the kure - a tank heater will raise the temp to around 90° and be a safe gentle heat. You can also use a candy thermometer in a pot on the stove and keep the temp at the correct level.

Acid of any form is detrimental to cement, so it's use should be sparing, if at all.

Never "shock" the rock. Taking cold rock and putting it in hot water can form micro-cracks, which over time can cause rock to crumble. The opposite is also true. Allow rock to slowly rise to target temperature for the best results.