What was the longest three minutes in Hubermann history in Part 6?

The longest three minutes took place when the Nazis were in the Hubermann's basement, measuring it to be used as a shelter.

THE LONGEST THREE MINUTES IN HUBERMANN HISTORY Papa sat at the table. Rosa prayed in the corner, mouthing the words. Liesel was cooked: her knee, her chest, the muscles in her arms. I doubt any of them had the audacity to consider what they’d do if the basement was appointed as a shelter. They had to survive the inspection first.

They listened to Nazi footsteps in the basement. There was the sound of measuring tape. Liesel could not ward off the thought of Max sitting beneath the steps, huddled around his sketchbook, hugging it to his chest.