Fetching details from the dictionary...
peak time; peak hours
ピーク時は混雑が激しい。
Congestion is severe during peak periods.
ピーク時には電力消費が増大する。
Power consumption increases during peak periods.
通勤のピーク時を避けて早朝に電車に乗ることにした。
I decided to take the train in the early morning to avoid the commuting rush.