Mayonnaise

As bought, in the cupboardabout 2 months

Once openedabout 8 weeks

Opening never extends a date: if the packet date comes sooner, go by that. Estimates for quality, not a safety ruling. What the dates mean

Mayonnaise keeps for about 2 months in the cupboard, counted from when you buy it. That's SnapLarder's estimate for mayonnaise in general. If the packet has a date, go by the packet: it's specific to that product.

How long does mayonnaise last once opened?

About 8 weeks. Opening never extends a date: if the date on the packet comes sooner, go by that. Check the label, too: some products need to go in the fridge once opened.

Can you freeze mayonnaise?

Not really. Mayonnaise doesn't freeze well: the texture changes when it thaws.