So I was at the Japanese market the other day and came across a display of Kewpie Mayonnaise. Having remembered posts here about it's unique taste and remembering that style from some past Japanese restaurant meals, I bought some. (I only saw one size on the shelf.)
Now that I've got it home I see that the package says it should be consumed within 30 days of opening. I would assume that has to do with it being made without the preservatives of a typical Hellman's Best Foods. Anyway............... my question is about whether that is a hard and fast rule from the knowledge or experience of those here. I don't use that much mayo and want to know if I can stretch that timing if I need to, without paying an uncomfortable price.