Well my guess is it may have more effect. But let me tell you that its not as easy as it sounds. I was doing it for about a week. It gets really boring, becasue even if you are only underwater for 1hr it always took me about 2 hours to finish. I dont know about you but holding my breath for as long as I can time after time isnt fun by any means.
So in regard to your question I do think you will get greater gain, but I also think you will get burnt out within a few days if you try to get 2 hours of underwater time a day. You will be spending about 4 hours in your pool a day. If you have the time and motivation I say go for it.
-Benny
