Two ways of fixing this. Shoot straight lacquer thinner over it several times till the moisture leaves it, or wait till it dries, sand, and shoot again but this time add retarder to your finish. How much will depend on the humidity. Retarder comes in gallons most of the time, and a gallon goes a long ways. Chances are you'll through out the remainder at the end of the year.
Shelf life depends.
The thing to bear in mind on retarder is that it slows the drying process down, so naturally it will take longer to finish a project. It also thins somewhat, so you have to test a piece for running Another trouble maker are runs. Runs happen for a number of reasons. Spraying to close to the object. Staying in one spot to long, material to thin, humidity causing sag, or someone upstairs is paying you back for something you did, and so on.