Thank you for Responding , however still doesn't fill my question
396Xt = 20 groups per system , 500 Tgid's per system
1000 sites , and so on
I feel that your question is clear the answer is not. As the data can fluctuate a little changing the amounts.
Like asking how much dose a gallon weigh? (A gallon of what) the upper limit of the container (at this time) is 1MB since this will load any system in the "database" directly, that solves 50%
Then you have favorite lists, which typically are broken into logical human lists, for the purpose of human. These lists are capable of quick keys 99 for each nested group. So there is the human useable list of some 99x99 math there but now a human wouldn't logically do that because it's confusing - the fav lists are for easy consumption of your most used data.
On top of that you can have multiple favorite lists, With a (software upper limit bound variable) but again - it's not logical for a human to reach these numbers - you would likely use GPS scanning against the database. Typically a human would use 4-10 lists for the area they are in or travel around.
So your looking for specifications that aren't limited by conventional scanner wisdom. So your answer is complicated and you won't find numbers with out some bored individual pressing the limits for the answer for all man kind.
I would suggest that if the features of the scanner as you see them advertised are compelling that you purchase the radio, your experience with it - for the purpose of its creation. to have a scanner that is in the home patrol line, but more for the classic scanner technologist. Will likely be positive, and the new limits of your hobby will grow with it.