Rule of thumb recommended by Stanley Marianski and Rytek Kutas is 1 day for every 1/4' when measured from the center point of the thickest part of the meat. A two inch slab of pork belly would take 4 days, 2' measured at center would give you 1" curing thickness divided by .25 would require 4 days curing time. The only exception is if the belly still has the skin in place. Because the cure does not penetrate through the skin in any efficient manner, you calculate the curing time from the entire thickness of the meat.
One of the main reasons people find Morton TenderQuick to be overly salty is because it contains no sugar. Morton TenderQuick is formulated as a general cure (meat, fish, poultry) and is also used for curing beef (corned beef), where sugar would be unwanted. For making bacon and ham, maybe the selection of Morton Sugar Cure would be a more suitable choice, but totally not necessary because you can add the sugar yourself to the mixture. Sugar helps to cut the salty edge in taste of the final product and can vary greatly in any recipe. Sugar is not necessary for curing, it is strictly for rounding out and balancing the flavors (salty, sweet, savory). Sugar levels can be adjusted to an individuals personal taste without affecting the curing process.
"Morton's TenderQuick" and "Morton's Sugar Cure" are brand names of another formulation of sodium nitrite, sodium nitrate, with salt, and sugars added. It is not the same concentration as "Cure #1. Since the amount of nitrite present in a recipe is essential for safety, one cannot take a recipe designed for Cure #1 and simply substitute like amounts of such products as "Morton's Tenderquick". To do so would invite the risk of botulism poisoning. Similarly, one cannot just substitute Cure #1 in place of "Morton's TenderQuick" without creating severe health risks. I do not advocate the use of substitutions, instead one should use a recipe designed for the specific cure being used.
Morton developed "TenderQuick" and "Sugar Cure", so that the home cook could safely cure meat. "Morton Tender Quick" is not a meat tenderizer, and the "Morton Sugar Cure" are not seasonings. They should be stored and locked far away from your normal everyday spice/salt cabinet. They do not have the red coloring agent, they should never be substituted for salt so be especially careful when using and storing these products to eliminate the possibility of poisoning your family.
"Morton TenderQuick" and "Morton Sugar Cure" are bonded premixed formulations of salt, sodium nitrite, and sodium nitrate to be used directly from the bag for the curing process, no additional salt is required for the cure, sugar is also added into the formulation in the case of "Morton Sugar Cure". Morton products contain 0.5% sodium nitrite, 0.5% sodium nitrate, and also includes propylene glycol to keep the mixture stable.
Because Morton products are pre-formulated to be used according to the manufactures recommendations, I highly recommend the use of this curing agent for someone curing for the first time, as well as for the beginner. The premix formulation makes it easy to measure the correct amount without having to purchase a scale or calculate the required amounts of each ingredient. Because it is pre-mixed it also makes it a little harder to make mistakes.
Cure #1 is a bonded mixture of 1 part sodium nitrite to 16 parts salt. Cure #1 must be mixed with additional salt (usually 3%) to safely and evenly distribute the curing agent during application.
Cures are commonly used in curing, smoking, air-drying, or dehydrating.