Objects is a sum of Circles+Sliders+Spinners. I'm not sure I need a number telling me what it is when I can see the sum of the three in my head.I did a BMath, not Accounting... dividing Objects by Length, after converting it into seconds and considering a fudge factor for the likely difference between Length and Drain Time, is more arithmetic than I'm normally expected to be able to do in my head. Adding a sum to the algorithm is unacceptable... the potential for mistakes and errors is already too high.
Replacement is a good suggestion. Addition is good too, but will take up more space.