Hello! I am new here. I need an answer quickly if anyone can help me. I am pushing 400 iso Ilford Delta 35mm film to 800iso. I need to figure out how long to develop the film for using D-76 1:1. My professor only told me to develop it for 25-50% longer than I would normal 400iso Delta film. But that's pretty broad so I'm looking for more specific answers. I also know it depends on the temperature of the chemicals, but still 25-50% is very broad to me. I haven't found anything on google, though maybe I just suck at searching. Any ideas?