Very quickly, almost instantaneously.
とても早く、ほとんど瞬時に。 (totemo hayaku, hotondo shunji ni)
"The discovery of the new planet happened in the blink of an eye."
"新しい惑星の発見はあっという間に起こった。" (atarashii wakusei no hakken wa atto iu ma ni okotta)
to listen carefully to someone’s problems or feelings
Time feels longer when you are waiting for something.
in a state of great happiness
to feel responsible for many problems or duties
To do something that may result in loss or danger.
the moment when a change becomes unstoppable