Most clubs chose to take players on a training camp for the majority of the two weeks they got away from Premier League duties.
Moyes gave his West Ham players some time off during those two weeks.
And he thinks that should be mandatory.
"My experience, coming from Spain, was that it was a two-week break," said Moyes in his press conference.
"But one week was compulsory and if you chose to give the players a little longer, that was up to you. Here it would be better if it was a week compulsory.
"We have to careful in this country that we don't introduce a break and then go back to not giving the players any time.
"Most clubs are trying to give the players some time off.
"If it was a break to go to a training camp we'd be thinking, 'What's the point?'
"We need to understand what the break is for. It's mainly mentally for the players - and the managers."