Questions & Answers about Это была самая долгая секундочка.
How does the diminutive секундочка change the tone compared to just saying секунда?
The suffix -очк- here is used for emotional effect rather than literal size. It adds a sense of irony or playful exaggeration. By calling it a "little second," the speaker heavily emphasizes the contrast with how excruciatingly долгая (long) that tiny unit of time actually felt.
Why is the verb была feminine when the sentence starts with the neuter pronoun это?
Could I use длинная instead of долгая for the word "longest"?
No, that would sound unnatural. In Russian, долгий is specifically used to describe a long duration of time (like a wait or a moment), whereas длинный describes physical length or distance (like a rope or a street).