The time it takes for a gas oven to reach 400 degrees Fahrenheit (about 204 degrees Celsius) can vary depending on several factors, including the specific oven model, its size, insulation, and the initial temperature of the oven before preheating.
In general, it takes approximately 10 to 15 minutes for a gas oven to reach 400 degrees Fahrenheit. However, keep in mind that some ovens may take longer, especially if they are older models or have poor insulation.
It's essential to use an oven thermometer to verify that the oven has reached the desired temperature accurately. Ovens can sometimes have temperature variations, so an oven thermometer will ensure your oven is properly calibrated for precise cooking. Preheating is essential for many recipes to achieve consistent and reliable cooking results.