This is something I've been wanting to do for a while!
Using the values I gathered and put onto the space engineers wikia (http://spaceengineers.wikia.com/wiki/Refinery?s=wldiff&diff=0&oldid=5372) I made this program to help you calculate how long certain batches of materials would take to refine or help you figure out how much ore you need to reach a certain goal of ingots if you rather want that. In both cases it will still tell you the time though.
Hopefully you guys find it useful!
Appears on these pages
Like the title suggests, I made a program for all of you guys to use whenever you need to...