Generally, it takes between 30 to 60 seconds for the NC° Thermometer Gen1 to measure your temperature. The thermometer will beep to indicate that the measurement has stabilized and is ready to be recorded in the app.
To make sure that you’re measuring correctly and that your thermometer is working as it should, we always recommend completing the Measuring Training in the app when you get started with Natural Cycles, which you can find under the top menu > My device.
We recommend reading the instructions in this article When and how to do the Measuring Training with NC° Thermometer Gen1 before completing the Measuring Training.