This is the 55th most frequent Persian word.
چند
"چند" means "how many" or "several" in English.
In this sentence, "چند" is used as a quantifier, meaning 'a few' or 'several'.
چند کتاب دارم.
I have a few books.
In this question, "چند" is used as an interrogative to inquire about a specific numerical value, in this case, time.
چند ساعت است؟
What time is it?
Here, "چند" indicates an approximate quantity of time, specifically used for days.