Default [Q] What is total free space on Note 3 32gb (is missing space OTA related?)

What is the typical free space that I should find available in my Note 3 (32gb)? Is 25gb only normal?

It's rooted and running safestrap but otherwise is stock.

ES file explorer SD card analyst says that I have 25gb stock space available and that I'm using 8 gb for a remainder of 17gb. Is this typical? That seems like a large amount to reserve for what I assume is the system. Using the 'Drives' app I show that system is using only 2.1gb with 555 mb free. It also shows that my internal storage has two large "files" that are maybe backup partitions called "win001" and "win000".