Depends on how you kept it and how you used it.
If kept in the fridge, it will keep quite a long time. My Clonex is well over 2 years old and still good. I had some stored in a cabinet go bad pretty quick, less than a year. This was before I learned about keeping it in the fridge.
If you didn't dip any clones into the main bottle and contaminate it. I pour just what I need for clones in a small bottle. A shot glass will work well also. Dump it when done, so you don't contaminate the main bottle. Another lesson learned the hard way. LOL
Wet