Two important parameters for Concepts are Retention and Retrieval.
But for humans, the retention capacity for concepts, appears to be without end.
Whereas even the best computers will eventually declare that their storage capacity is full, I have never heard anyone say that their brain is full and they can not learn another thing!
Equally impressive to our amazing storage capacity for concepts, is our ability to retrieve them. I look out the window and see a rose.
How long did it take me to recognize it? It seems to me to be instantaneous. Yet there was a surge of electro-chemical activity in my brain prior to recognition.
In this brief activity the brain formulated a pattern and found a match for the rose from among hundreds of thousands of stored possible concepts.
These are all processes, however, and they can and do fail!