Dear community
I use a Nikon Z9 with 45mpix which I think is far too many for a 4K timelapse.
What about setting to RAW M which equals about to 20mpix (ca.6000 pix to the long side).
Question:
Do I loose any quality on using this setting.

I very much appreceate your opinion

I wouldn't recommend using smaller raw settings. You would sacrifice quality.
8K is getting common and in a few years everything will be 8k. Like a couple of years ago people thought Full HD was a high resolution.
Why throw away the quality you payed for? You might regret it in the future.

Thanks Gunther I also just recogniced that L.M.S is only for JPGs, sorry for bothering you