This tried another one with 5 prefix and 3 suffix, but that didn't yield anything in over two months. So not sure if there are suffixes that cannot be resolved, even though it does work when I tried mining one with only the 3 letter suffix. 

 Can you do both a prefix and a suffix? 

 Rana can do that.

https://github.com/grunch/rana 

 How long will it take to do a 5 prefix and 4 suffix? 

 I haven't seen a nine character vanity. That can literally take months on a high spec multi core machine. 

 I'm going to try 8 character, mining 2 cores, pow = 36.