Welcome to FT RodMunch

You'll find that every ticket has different rules, depending on what airline and what cities and how much you pay, so it's hard to answer. That said, I think that if you bought an actual "open return" (Which is a very flexible type of ticket), I'd bet that it's one year, no less.

I'd just call the airline, but if you want to do more research yourself, see if you can find the rules of the ticket.

One good place to start is here . Plug in your info and limit it to JL and you will see a wide array of fares. Click on the info and you can see rule details.