If you will stay in Japan over 90 days, you need to obtain a research visa. It will require about three months to obtain the visa.
At least 4 months before commencing the research activity.
If an applicant do not need to obtain a visa, he/she shall submit two months prior to his/her visit.
International researchers are strongly advised to begin the procedures for visa extension three months prior to the expiration date.
The resident card will be provided at the international airport upon your arrival. You must return the resident card when you go back to your country except for a short return.
Researchers who will be reentering Japan within 1 year of their departure to continue his/her research in Japan will not be required to apply for a re-entry permit.