A Director Penalty Notice lands and the 21-day clock starts immediately....

https://wiki-dale.win/index.php/How_to_Check_Your_ASIC_Address_and_Avoid_the_DPN_%22Service_by_Post%22_Trap

A Director Penalty Notice lands and the 21-day clock starts immediately. Knowing whether it’s a lockdown or non-lockdown DPN changes everything for your client's liability