My guess is something is hanging or not configured correctly. Like a mount or a networking device or something. It will sit there and retry a bunch before moving on.
PopOS lets me hit escape during the boot process and see a live view of whats happening. I don’t know if that exists on Manjaro. Otherwise, you can look at /var/log/boot.log to see if something’s failed (it also might save in boot.log.1, boot.log.2, etc).
@Kruemel@feddit.de 's advice seems cool but I’ve never tried that before.