rabbitoid:
I usually have about 20-30 ponds active at the same time. Most of them 2-4 day ponds of all kinds. I also look for the ponds with most players in, as I think they are easier to play. The raise in bids is slower and easier to predict with 25-40 players involved.

Before I sometimes had 70-80 ponds at the same time, and it took me a great deal of time wading through them all. However I have not lost interest. :-)