How long does it take for a Japanese invention patent application to be granted?

• via Paris Convention : 6 months from earliest priority date.
• Hague Agreement route: 6 months from earliest priority date.

Inventors have a novelty grace period of 12 months after disclosure (including sale).

3-6 months

yes. Multiple designs may be included in one design application.

10 years

yes

5-7 months

Inventors have a novelty grace period of 12 months after disclosure (including sale).

yes

Reinstatement of priority on grounds of "due care" accepted.