📚 Out of curiosity, how much do you have in your /usr + /opt?

If you will, you could run the following code on your terminal:

for i in $(echo /usr /opt); do du -h $i 2>&1 | tail -n1;done 

I was wondering how much space people actually use in their system partitions. In my case:

11G /usr 338M /opt 

Also, for how long do you have this particular install? Mine is about 2yo (when I bought my current laptop)