This actually works. I keep mine in the freezer. Generally speaking, cold slows down any chemical reaction, including the polymerization that causes super glue curing.

Also, super glue polymerization requires water, so keeping it in a low humidity area (like a fridge or freezer: cold air holds less water) extends its shelf life further.

By far the best super glue extension method in my opinion is to just buy a bunch of single use sizes.