i want to know what ratio is boils down to the numbers in buildings and amount of real time in sec.
That's really complicated. Real time is a function of the speed of your computer sometimes since the game is designed to run at 30 frames/second. If it cannot, then events on the map may take longer than intended - commonly referred to as "lag".
Units also request construction packets at different rates and the rates are subject to change when a Forge is present and build speed upgrades are incorporated.
A third factor is the presence of energy to actually dispatch the required number of packets.
So the best answer is "it depends". :)
Not to mention distance traveled; but since multiple packets can be released at once, after a certain distance, this becomes additive, not multiplicative, I think.
There are so many variables to that question, it's impossible to answer without saying "depends".