It may depend on the species of quail, not to mention the individual bird her self.
I lost my dino coturnix hen after 3.5 years during the freaky weather conditions here. She laid an egg at least 48 hours before she died. It really depends on a number of variables.
I don't compare "Quail" of any species to chickens...because they are not chickens.
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A sand box will provide all the grit they need..... little dirt, little sand, little D.E., oil dry from carquest is 100% D.E., just be sure it says 100%. I use it and they love it. You can get crushed oyster shell at farm supply stores too for calcium\\grit.