Final answer:
The recommended size for a /home directory is 10 GB as a baseline for most users, with variations depending on individual needs and system usage.
Step-by-step explanation:
The recommended size for a /home directory per user can vary tremendously based on the individual's needs and the intended use of the system. There is no one-size-fits-all answer. However, for most users, 10 GB is a good baseline. It allows enough space for documents, photos, and typical personal use. A size of 1 GB may be too small for today's standards, as files and applications require more space. 100 GB might be necessary for users who work with large files, like videos or large datasets. 1000 GB (1 TB) is usually more than the average user would need for a /home directory, but could be appropriate for professional video editors, graphic designers, or data scientists who require extensive storage space.