Every time you open the app it downloads the most recent price data. The app uses the 4-hours interval price data (like viewing a candle chart where each candle represents 4 hours). That means you get 6 price points in one day. Logically, the biggest "delay" - compared to the current price can be 4 hours. I tried to make the interval 1 hour, or even 15 minutes, but then the app gets very laggy.
Thanks for your reply