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1) Everything except /boot is encrypted. What you did was create an encrypted device, which then was given to the Linux logical volume manager. This took no noticeable amount of time because you weren't actually encrypting data at the time, you were just telling the device to do writes through the encryption layer. The logical volume was empty, and then you filled it with lovely Fedora stuff by completing the install. If you're not shy of the command line, run "sudo pvdisplay" - it will show you the name of your encrypted device as /dev/mapper/luks-<some hexadecimal="" gibberish="">. LUKS stands for Linux Unified Key Setup.

2) You can't actually change the password. What you can do is create a new one, and destroy the old one. As root:

cryptsetup luksAddKey /dev/mapper/luks-<hex stuff>
crypysetup luksDelKey /dev/mapper/luks-<hex stuff> 0

This assumes the old key was at slot 0. Take a look at the manpage for cryptsetup for more.