Stories in English, particulary those for children, often start with ‘Once upon a time’ or something similar, such as ‘A long time ago in a land far away’. They usually end with ‘…and they lived happily ever after.’ or something similar.
In Irish stories typically start with Fadó, fadó’ (a long, long time ago), Welsh stories start with ‘un tro’ (one time), while Japanese stories often begin with ‘昔々’ (mukashi mukashi), or ‘a long, long time ago’.
What about in other languages?