Periods  /ˈpɪərɪəds/  

Plural noun

Synonyms: Eras, ages, epochs, times, spells,

Hindi: काल
Punjabi: ਮਿਆਦ

Meaning:

Periods is a plural noun for a word "PERIOD."

Period: 1. A length or portion of the time.

2. A portion of time in the life of a nation, civilization, etc. characterized by the same prevalent features or conditions.

3. A major division of geological time that is a subdivision of an era and is itself subdivided into epochs.

Sentence:

It was in the way Manpreet stood, gazing absently out the window for long periods of time.