The estimate time when meting or replacing song in a youtube studio

Does someone know the estimated time for doing mute / replace song on youtube?
Let’s say my youtube video (a live past stream to be precise) contain song with 5 minutes song. Then I do song mute / replace, technically it’s different, so I assume it will differ the mute and replacement. Is it possible that the processing takes less time than 5 minutes, I mean less than the duration of the sound to be added? The new studio takes some time before the copyright claim appears, I assume they (the machine) already have metadata (cache or some sort).