Farming time pieces?

I was at memory monks for a good while and hardly got any. It was something like 1 every 4 hours on 2x drop and that was with my 17x bucc. I was told that oblivion 4 was lots better and headed there. My first 4 hour 2x drop session I averaged about 3 an hour so it was a much better improvement from memory maps. I think luck has a good amount to do with it as well though.