Ok, so as stated above without stats including previous cycle experience it is VERY difficult for anyone to give appropriate input.
With that said, (ignoring your lack of info) I have run dbol only cycles for 8 weeks in my youth with fabulous results!! HOWEVER, the gains were always solid in the 1st 3 / 4 weeks. Now in my older more experienced days one could easily hypothesize that was because my natural test was adequate to support the dbol until it "shut down".
I'm currently running dbol in my cycle and extremely pleased at 50mg a day divided into 4 doses a day. The multiple doses for me at least is because dbol gives me nausea / gas etc. so breaking it up eases this. Dbol also has a short life so the doses do need to be spaced out.
Although, I'm giving broad spectrum advice here AGAIN take it with a grain of salt. We really need more info from you! ;-)
E