[agumonkey]

I wonder how long on average something becomes heritage. 100 years ? is it n generation ? after 5 generation, your grandmother's grandmother was born there so you're 99% from her culture (all your siblings are, you and their memories are)

[bobthepanda]

Most recipes have only standardized in the last 100 years or so. We didn't have exact temperature controls on ovens or stoves until the 1930s, which is a fairly easy way to tell, and even cooking units vary across time, place, and even household. (How big is a teacup? Depends on your glassware.)