Ideal speaking time for Eiken Pre 1

It was brought to my attention by my boss that a returnee student I was helping with Eiken Pre 1 with native level English failed the interview portion because her narration of the story was 45 seconds, despite it being accurate and correct in grammar. She then explained that the sweet spot is 1 minute and 30. It felt like she was blaming me in a way, as if I were supposed to know this.

In any case, so that I don't repeat the same mistake again, could we share some pointers as teachers on how Eiken is judged, ideal response times, etc..

Thanks in advance!

by JammerLemur