COD, how long are Reports flagged/saved on account?

Hello

I wanted to ask if anyone knows how long Reports are flagged/saved on account?

No ones knows. You better off not wasting time looking for answers about stuff like that.
Once you been flagged or shadowban often. You might as well get a spoofer. But I get
none of us want to spend money for other things. I use rage setting, unlock all, and Avg. 19-25 kills a game no flag and only been shadow once for 24hrs.

There is no way to for sure know. At the end of the day, you should always try to be aware of your playstyle and the precautions you take if you are trying to prevent a ban or flag.