Why does my bottom lip still tingle after wisdom teeth removal?

I just had my 4 wisdom teeth removed at noon today (it's 5:45 right now) and while I can feel my tongue again (I couldn't right after surgery), my bottom lip (chin and that small nearby area too) is still numb and tingles a little. I was put under general anesthesia and I was also given a local anesthesia. If I touch it I can feel myself touching it but it still feels big and numb. How long is this supposed to last?

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