Khronos, depends on many things but as far as I can see; if you were to no-life it you could very well reach (60) within just under 24 hours.
Secondly; Hello to everyone, I'm new here. Thirdly; This guide is excellent for DB-ing with the Recruit-a-Friend bonus, I've levelled to 60 in
just over a day and a bit with it, I didn't find it to be buggy or inefficient, it just seemed to work well. Oh well; each to their own I guess.

Keep up the awesome work here,
-Alanna // Saucy