CA reacts with moisture and oxygen in the air, and will solidify in time.

A properly closed container will last quite a long time.

I've taken to installing the capillary type tips on my CA bottles.

The tip is so fine that air cannot get in, yet the bottle is effectively always open and ready to dispense... ( just don't drop it! ).

I've left bottles with the tips on this way for six months and more without any problems.