Do international talents quit too soon in Japanese companies?

It depends on the individual’s experiences. There are people who work long and short experience at their companies.

Compared to Japanese workers, foreign talents do not have the same value of lifetime employment at one company.
Because of these differences, foreign talents tend to change companies in 2-3 years, due to their values of career path, salary hike, promotion etc. But, as for foreign talent who had changed companies within a year many times, it is deemed to seem like a job hopper. This is the same as other countries as well.

For companies that want to attract candidates who want to have them work for a longer period, they have common points such as well engagement between the worker and company, career up support, proper communication.