Some people prefer the 2:2:100 dilution as it is more energetic and develops a given film faster to the same contrast. I calculate that you reduce development times with the 2:2:100 dilution about 35% compared to the 1:1:100 dilution. In other words, if your standard is ten minutes with the 1:1:100 dilution, try about six and one-half minutes with 2:2:100 to get the same contrast.
Some people prefer the 2:2:100 dilution as it is more energetic and develops a given film faster to the same contrast. I calculate that you reduce development times with the 2:2:100 dilution about 35% compared to the 1:1:100 dilution. In other words, if your standard is ten minutes with the 1:1:100 dilution, try about six and one-half minutes with 2:2:100 to get the same contrast.