This is a bit like "how long is a piece of string" type question as every manufacturer utolises varying ingrediances and therefore they all have a different shelf life.
In general terms most liquids would last between 12/18 months un opend and 6/9 months once opend.
Of course how you store the liquid will also could have an adverse effect to this.
Again generally speaking best kept in a cool,dry place out of direct sunlight particularly once opend.
In hot summer months a good tip is to store your liquid in a fridge.
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