I can't see it clearly,you'd better zoom in,also it depends on how you got it.
If you got it from an event or something similar,it will most likely expire after next maintenance,if not it means it can't be traded or sold or discarded/bank shared i guess?
But i need you to zoom in to be able translate it correctly.
Well it says 1-day on title and the red text says
'After this period, the effect disappears.'
So more or less: After 1 day, the effect disappears.
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So something that may have been true a month ago may not be true now. Check the date before you reply!
So that means I can keep it and use it when I want to right.
They usually have time limits in green text at the bottom, so I'm guessing yes.