What's your budget? Rock and blues, so you're looking for electric? What's your current axe? What do you like about it and what do you not like about it?
I throw all of those questions out there because I think that info will help others give you good advice. I know almost nothing about electrics and not much more about acoustics, so I won't be able to actually suggest anything. Good luck!
It takes as long as it takes unless you quit - then it takes forever and you will never get there.