Seriously. Don't waste your money on glue. Just make extra Weet Bix and milk in the morning.
It may take some time to dry. I'm not sure - who knows how long this blob of Weet Bix and milk has been on the chair/couch/table/unwashed bowl/unwashed spoon/[insert other household item here]?
But however long it takes to dry, you can be confident that once it does, it ain't going anywhere.
Weet-Bix-and-milk-glue is the bane of my existence today. What's the bane of yours?