I do leave the top off for lot of hours and I’ve found this tends to make the glue a little thick or the sides become dry and then I find I’m wasting glue.
So, I found a really quick solution.  I grab a small mason jar and pour from the larger container.  The mason jar seals enough to work perfect for my projects and the glue inside seems to stay ‘fresh’.  Plus, who doesn’t love mason jars, right?