M31 (NGC 224, UGC 454, PGC 2557 and numerous others) is a large spiral galaxy located approximately 2.67 million light-years away (https://iopscience.iop.org/article/10.3847/1538-3881/153/1/6/pdf) in Andromeda.
Luminance – 37x600s – 370 minutes – binned 1x1
RGB – 38:39:35x600s – 380:390:350 minutes each – binned 1x1
1490 minutes total exposure – 24 hours 50 minutes
Imaged numerous nights in the 2021 season at the IC Astronomy Observatory (Spain) with a FLI PL16083 on a Takahashi FSQ-106EDX4 at f/3.6 382 mm.
LRGB - https://www.flickr.com/photos/dcrowson/52337468681/sizes/l/
This data is from Telescope Live (https://telescope.live/) “One-click Observations.”