Hello, Lucille -
See the information here:
How to Pan-Roast Pork Tenderloin
https://www.bettycrocker.com/how-to/tipslibrary/meat-poultry-fish/how-cook-pork-tenderloin
The cooking time given at 425 degrees Fahrenheit is for 20-30 minutes for every 3/4 - 1 pound of pork tenderloin (based on the cooking chart information on the web page cited above.)
Note: If you do not reside in the USA and therefore use Celsius temperature measurement, then, the cooking temperature will be about 218 degrees Celsius and the internal temperature, taken with an internal meat thermometer, should be about 52 degrees C when done.
See temperature conversion program here:
http://www.onlineconversion.com/temperature.htm
Best wishes.
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