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Novacaine can last as little as a couple of hours or up to 8 hrs depending how much novacaine was used. If you were given novacaine in the afternoon you should feel better by morning
http://answers.ask.com/Health/Other/how_long_does_...
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2-3 hours
http://wiki.answers.com/Q/How_long_dose_Novocaine_...
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Novocaine is absorbed very quickly and starts to kick-in in about two to five minutes,
http://www.chacha.com/question/how-long-does-novoc...
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In most cases it's best for the anesthetic to last for several hours after an extraction so you don't feel the soreness. It also helps with bleeding, depending on what type they use
http://answers.yahoo.com/question/index?qid=200804...
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