How long do u acclimate new fish? & SAD story to follow.

[Dabbler]

I to float the bag for about 20 minutes then add a "yogurt" container to the bag, then about 20 min later I take one container of water out of the bag and then add another one. I do the about 4 to 5 times ( and depending on the size of bag and fish) so by the time I am done I should have 95- 100% of my water in the bag, then I net the fish and put it in the tank. None of the bag water enters my tank.