Yes- within 12 months from the date of first filing of the priority application.
20 years starting from the filing date.
If the patent is not exploited within 3 years from the date of grant, it will be subject to compulsory licensing. (or working is stopped for 2 consecutive years)
Annuities are to be paid starting from the fifth year of the patent term and are paid in advance at the beginning of the fourth year.