The shelf-life of concrete mix usually varies from a couple of months to several. If it has been stored in an airtight container in an environment where the temperature and humidity have been controlled (which is highly unlikely), it may last up to a year.

How long does ready mixed mortar last?

Ready mixed mortar stays workable up to 3 days, but once it's in the wall it sets like conventional job- mixed mortar.

Can you use out of date mortar?

We strongly recommend that you do not use any cement that has exceeded its use by date. The use by date on cement is related to health and safety regulations about 'chromium VI' which can cause allergic dermatitis.