According to the Model Code for Securities Transactions by Directors of Listed Issuers in Hong Kong Listing Rules, when are directors prohibited from trading the issuer’s securities?

ID : 1891
Long answer : Directors must not trade if they have inside information (e.g., pending mergers) or during blackout periods. (Source: https://en-rules.hkex.com.hk/sites/default/files/net_file_store/HKEX4476_3785_VER31169.pdf)
Short answer : When they possess unpublished price-sensitive information or during blackout periods.
answer 2 : Only on weekends.
answer 3 : Two days after public announcements.
answer 4 : During shareholder meetings.