Why does this Chronograph stop after 50 Minutes?

Usually a chronograph has a +30h power reserve - so why does this one only have 50min? Discussing the 3 main characteristics of the Defy El Primero 21 we're going to take a deep dive into one of the most fascinating watches ever! 02:20 Characteristic #1: The case 03:53 Characteristic #2: The dial 05:24 Characteristic #3: The movement Dimensions of the Zenith Defy El Primero 21: Diameter: 44mm Height/Thickness: 14,6mm Lug to lug: 50mm How do you like the Defy 21? A bit "too much" or the best thing yet? What are your thoughts on titanium watches? Let me know in the comments down below! Thank you for watching! If you've liked the video, make sure to give it a thumbs up and if you want to see more videos like this I highly recommend subscribing to my channel 😉 it really helps the channel out! - Jenni ❤️