yes it's normal that the brute forcing takes many time and the finding of the password is not guarantee due to various technical reasons.
The usage of -d 10 is suggested only if you are 100% that the server you are testing has not the half second limit (for example uses my rcon disabling fix).
Anyway remember that with -d 10, if the password is found, the one which will be displayed on the screen could not be the right one, due to time reasons (this is something I need to fix in these days).
For the wordlists exist many sources (also some torrents), some of them are collected here:
http://packetstormsecurity.org/Crackers/wordlists/