The runes are still really rare, considering I played a lot and had a drop rate of (just a guess from my memories) around 1-3 per week.
Did you play 100-300 hours per week? I wouldn't expect you to clear CS much faster than me without a serious gear advantage. And I doubt, that another zone is as effective.
I can clear the CS within the first week of a ladder with a sorc. I kill everything with Blizzard that is not immune and lord de seis will suffer from my mercenary. Depending on the other affixes from lord de seis, a run can be as fast as 2 minutes, but it can also take 5 minutes.
on /players 8?
http://eu.battle.net/d3/en/profile/Sol77-2972/hero/66110450