Depends on how much you play everyday, but it shouldn't take more than a week. At your level, do c1 smalls on all dungeons except for the last 5 floors, which should be c6 small. At around level 50-60, you'll want to replace the last 5 floors with c6 larges with 5 people. At higher levels, rush c1 smalls til floor 30, then do c5 larges with 5 people from there. That's how i got 80 dungeoneering. I hope this helped!