Pickles and use-by-date fears...

Hey there, I have a surplus of Korean Takuan-type pickles (I bought a big pack of beautiful sun-like slices) and was wondering how long one should keep them in the fridge? They're in a tupperware type thingy, but as there was no date on the packaging, I keep getting the fear - I have a bit of an obsession with use-by-dates, which my other half finds very odd. As they are preserved, I figured they could live in there for a while, but as I say...I got the fear now, and so keep using them in EVERY meal in my haste to get through 'em!
Taxonomy upgrade extras: