Data - Frequency
Eve Room and Eve Weather perform a measurement every 10 minutes. These values are stored in the historical data of the Eve accessory.
When opening (or triggering a refresh) the Eve app will request up-to-date values from the Eve accessories. The historical data will also be downloaded and stored within the Eve app.
Data - Storage
Eve Room and Eve Weather store data for approximately 14 days.
You will get continuous records in the Eve app if you connect regularly to the device, e.g. once a week, and download the data before memory flows over.