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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HICKORY CREEK, TEXAS (Hunt County). Hickory Creek is at the intersection of Farm roads 272 and 816, twelve miles northwest of Greenville in north central Hunt County. It was settled in the 1870s and developed around a cotton gin, gristmill, and general store operated by W. F. Felty.