You may have meant to imply average, but it isn't implied in what you wrote. I suppose total was implied, but Obama doesn't have an 8 year total.
The only way to compare a president that served 2 terms (8 years) and a President that served a full term (4 years) and is working on his 2nd term (4 years) would be to compare the completed term with other completed terms (which is what I did) or compute a daily average.
Neither is particularly useful in my opinion, but whatever.
Sure. It would literally mean nothing though. He could sign 300 executive orders this year if he felt so inclined.