Calculating QT interval duration Count the number of squares from the beginning of the QRS complex to the end of the T wave. Multiply this number by 0.04 second. The normal range is 0.36 to 0.44 second, or 9 to 11 small squares wide.alculating QT interval duration Count the number of squares from the beginning of the QRS complex to the end of the T wave. Multiply this number by 0.04 second. The normal range is 0.36 to 0.44 second, or 9 to 11 small squares wide.
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Walnut, California. Not to be confused with Walnut Grove, California or Walnut Creek, California. Walnut is a suburban city in the eastern part of Los Angeles County in California. Money's Best Places to Live ranked Walnut #70 in 2009 and #57 in 2011, the highest ranking for a Californian city both years.