@MovingSounds
That does not sound normal. Although it's not the bitrate or the size of the collection that makes the most difference, it's the number of files.
For me with a collection of 24432 FLAC files (625GB), a scan is usually done in under 15 minutes on an SSD disk.
But with the song fingerprinting or ebur128 analysis options on it will take much longer.
Is your source a local disk? Is it an SSD disk? How many files do you have in total under the directory added in Collection, including all files not just audio files? What audio formats? Do you have the fingerprinting or ebur128 options on?