waiting period
General term for a required waiting time before something can proceed, such as in insurance, employment, or legal contexts.
Once the insurance waiting period has passed, benefits will begin.
quarantine period
Specifically used for a period of isolation to prevent the spread of disease, often in medical or public health contexts.
People returning from abroad are required to undergo a two-week quarantine period.
待機 means 'standing by' or 'waiting ready,' while 待機期間 is the specific period of that waiting.
期間 is a general word for 'period' or 'term'; 待機期間 combines it with 待機 to specify a waiting or quarantine period.
Compound of 待機 (standby, waiting) and 期間 (period, term).