Unlike Black and white, C-41 film is processed at the same time and temperature, regardless of manufacturer or ISO. A 1 liter kit will develop anywhere from 8 rolls (what the box says) to double that or even more (what others have tried). I usually play it safe and only develop 10. Once you mix the chemicals, you will need to use them up. It's a use-or-lose. So I'd encourage you to not start developing until you have more than the one roll... try to at least have the 8. Have fun!