He said it's been 200 years since he tasted the pork strew. So say their mom was 35 at the time of the butcher + Conny interaction, since she died at 75 and he said 40 years had passed. That means ~130 years at minimum between then and current time, depending on if she made that same soup throughout those 40 years up until she died. A bit longer if she didn't cause she couldn't cook from old age.