After installing the latest firmware in my Snapmaker A350 decided to try out using a serial port USB connection rather than WiFi from Luban. For the most part it is working fine, although I also see the repeated "Unknown command: “M1011"” already reported as a bug.
However, I see another bug. The “Remaining Time” estimate is way too large. During the course of printing, the estimate reduces at a rapid rate, asymptotically approaching the true value.
Here are some screenshots after just starting a print job that was estimated at just over 11 hours when the GCode was generated. The first two screenshots are 43 seconds apart but during that time, the estimate reduced by more than 6 hours. The third image is another 13 minutes later and the estimate reduced by approximately 25 hours: