at 2" thick, I would go 7 days minimum. You can cure longer if you use an Equilibrium cure. Its pretty simple. Weigh the pork belly, after trimming... You want to weigh what piece is going in the bag, so if you're doing 2 bags, do each separately.
Then you determine how much Salt, sugar, pepper, etc you are going to add by adding a % of that weight...
So for example, 3% salt is pretty standard.. So if your belly weighed 1000 grams,
3% Salt = 30 grams
1% Sugar = 10 Grams
.5% Pepper = 5 Grams
.5% Garlic = 5 Grams
.25% Cure #1 = 2.5 grams
You can set your % preferences based on the flavor profile you want. I usually go heavy on the sugar (2-2.5%) and heavier on the pepper (1.5) ish but you reallycan't go wrong.. add whatever you like to it! As long as you add .25% Pink salt and 2-4% salt, you'll get bacon. @ 2%, you will not taste any salt, at 4% it will be pretty salty, you decide how you want it...
Anyway, by using this method, you can let this cure in your fridge for a month or longer... It will never go past where it should be, flavor wise..