Before I had a sizable inventory of soap, I was lucky to get 3 weeks for a cure. Even with a short cure, any of my soaps were nicer than any of the commercial bars that I was using. Now I'm ahead of the game and the average that I gift or use my soaps are more like 6 months. But I'm pretty sure they are cured enough by 6-8 weeks.
I'd have to play around with my soap recipes again in soap calc, but think that it was the addition of butters that upped the longevity in my soaps. I have used both shea and cocoa butters with my lard recipes, depending on what I have on hand.
I sort of measure the success of my soap by how much I have to use lotion on my skin. And with the lard, RBO combo it isn't very often...mostly my feet or hands after dishes, etc. But before I started making soap it was several times a day to make my hands feel like they wouldn't snag on a dish cloth! Since then I stopped using olive oil as I noticed an itch which was no longer there when I changed to RBO. What works for my skin may not work for yours. Mine is 80 years old and I live in a dry climate. Unless I get a complaint from my kids, I don't feel the need to change my recipes...and they use my soap all the time. Hubby is a different story! LOL
My advice is to make small batches, give them at least 4 weeks cure, unless you are olive oil heavy, to see what your skin likes. This site will give you hundreds of recipes to try...i could probably soap daily for a year and still not do the same recipe! Good luck