Im not getting this perfectly. Say my normal fixing is 5 minutes with one bath fixing. I then split the time in half, 2.30 minutes. This is my new fixing time. 1.15 minutes I use in the first bath and 1.15 minutes I use in the second bath. Is this the way I should understand it?
No. If your single-bath fixing time is 5 minutes, split it in half and fix for 2 1/2 minutes in each fixing bath with two-bath fixing. It's just that the two bath fixing will fix more thoroughly and fixing for two times 2 minutes will be sufficient as well. So, 5 minutes once turns into 2 minutes twice.