Fewer or Less?
Use
fewer with countable nouns,
less with uncountable nouns. For example, There were fewer students in class today and I ate less than she did. Even though hours are countable, you generally use
less with time and money. For example, I have less than 10 minutes left to finish this post. However, if you refer to specific units of time or money, you can use fewer. For example, I have fewer than ten silver coins.