毎時

1. Origins, structure, and basic meaning

• Structure: 毎時 is read as まいじ and means “every hour” and “per hour”.
• Basic usage: It marks a train departing at fifteen minutes past every hour and a pump moving 300 liters per hour.

2. Common pitfalls and similar expressions

• 毎時十五分 / 毎時三百リットル
  • 毎時十五分 marks a recurring clock time, while 毎時三百リットル states a per-hour rate.