The bigger issue is that he is likely now without a work visa and has to scramble to avoid deportation.
The grace period can vary wildly by country and, often, by the type of visa or work permit you hold. Just in my own sphere of experience, for example:
- Hong Kong GEP holders can stay for the length of their original permit, while people on domestic help visas get only 14 days
- EU Blue Card and Japanese work visa holders get 90 days
- US H-1B holders get 60 days
- Singaporean EP and Chinese Z-visa holders get 30 days
Of course there are ways to extend all of these (and some are much easier than others) but you can't legally work unless and until you find a new sponsor.
In basis. If you can still support yourself and you are still looking for a job Japan has no issues extending this.
It isn't the same doom, but doom nonetheless.