Lowest right now is 51 days, so looks like 50 days is about right.
EDIT
Also, for those who want to check who has Trust Level 3: https://eu.forums.blizzard.com/en/wow/groups/trust_level_3?desc=true&order=last_seen_at
Lowest right now is 51 days, so looks like 50 days is about right.
EDIT
Also, for those who want to check who has Trust Level 3: https://eu.forums.blizzard.com/en/wow/groups/trust_level_3?desc=true&order=last_seen_at