You have to be careful when using glue fillets. If they are too large, the glue will cure on the outside, but then it will have a center of still-liquid glue...kind of like a candy with a hard shell and a liquid center. It will take a very long time for that bit to cure, since the water will have to migrate out from the center, through the hardened shell.

If you are using fillets of glue to make a joint stronger, then you need just enough glue so that it's visible. Much more doesn't really add to strength, and it does add up to a lot of weight. If you run a fillet along a joint, and then use a cotton swab to remove as much as possible, the very small bead left is enough to insure a good joint. However, properly done, you need zero glue as a fillet. If you do any testing, you'll find that a fillet adds little to a properly-done glue joint. If you need to add strength, then glue in a bit of glass cloth or chopped fibers...even add a bit of wood stock to brace the joint. Those are ways to add real reinforcement.