While installing MINIX is was asked how big do want
/home to be.
--- Step 5: Select the size of /home ---------------
MINIX will take up 611 MB, without /home.
How big do you want your /home to be in MB (0-1435) ? 
After pressing enter
287 MB Ok? [Y]
What's the reason of asking that? Is it possible to change it later on?
I was never asked such a question while install Ubuntu (Linux) and I'm free (guessing) to store as much data in it as I want, limited by the partition size.
Installing on 2 GB virtual drive.