In the Dolomite mountains (the mineral calcium magnesium cabonate is called dolomite, and because it was there that the geologist Déodat de Dolomieu first identified the mineral, both the mineral and the mountains were so named), there is a mountain massif which the Italians call the Gruppo Sella.
The highest peak in the massif, Boè, reaches an elevation of 3151 meters above mean sea level. These limestone cliffs rest on basement rock, but let us just consider the portions which lie above mean sea level.
Had this rock been formed a millimeter at a time, it would have required 3,151,000 years to form--a figure to which, obviously, "real life" objects. But let us look at the math in other ways. Had the magnesium carbonate been deposited a centimeter at a time (1/5 of an inch), it would have taken 315,100 years to form. If it had been deposited a decimeter at a time (4"), it would have taken 31,510 years to form. To have been formed in 6000 years, it would have required a deposition of the magnesium carbonate at an average rate of more than 20" per year, every year for that 6000 years.
The member "real life" is positing that the deposition of minerals can occur at much faster rates that is implicit in the rate for an old earth--and he objects to the concept of an old earth. So i would ask, what evidence does "real life" have that limestones can be deposited at a rate as fast as 20"+, every year for thousands of years on end. (A meter is 39.36 inches, half that is 19.68 inches--to deposit more than 3000 meters of material in 6000 years time would require an average deposition rate of more than 20" per annum for the entire period.)
Even the extraordinary deposition rate of 4" per annum would have required more than 30,000 years to accomplish the formation, and would have required an average annual deposition rate of 4" for every one of those more than 30,000 years. Even such an extraodinarily heavy constant average rate of deposition shoots "real life's" young earth theories in the ass. The proposition is too absurd to consider.