This is the 333rd most frequent Russian word.
сколько
"How much" or "how many."
Here, 'сколько' is used to ask about a quantity or amount of time.
Сколько времени у нас осталось до начала?
How much time do we have left until the start?
In this sentence, 'сколько' inquires about the number of certain items (apples).
Сколько яблок ты купил на рынке?
How many apples did you buy at the market?
This use of 'сколько' is to ask about the price of an object.