A good place to start would be the electrode manufacturing websites.

The "operating Factor" is going to be dependent upon the weledr, the environment,the electrode, the procedure etc

The operating factor will be better for a 1" in 14" stub loss than 4" in 14" . Slag removal time will vary with position, access etc... Long continious welds will have a higher production factor than stitch welds.

The operating factor would be something you have to study for yourself. I can have a VERY high operating factor depositing 10 lbs of weld metal on a flat butt weld that only has one pass 10 feet long compared to that same 10 lbs that takes 5 passes 2' long.

7024 will have a different amount of time compared to a 7010 or 7018. Even in the same joint.

There is no set operating factor that works for all conditions. I would suggest a time study of your welders. Total Arc Time/Total Work time.