Supposing that, a player is supposed to spend 60 minutes in a training session. He spends 57 minutes. We say:
You have spent less minutes.
Is it right? I feel it is not, since 'less' modifies 'an uncountable noun'. But if we say:
You have spent fewer minutes.
It gives an impression that:
The player hasn't stayed long for the training session. Such as he spent only 5 to 10 minutes.
Question is, how to describe this thing (that the player has spent less time than he was supposed to) using the word 'minutes' a countable noun?