Hazard is in his first season in England after arriving from Lille last summer.
He told chelseafc.com: "The biggest difference I have found between the football in England and that in France is the intensity.
"In France, the game can be quiet for spells, maybe five or 10 minutes. But not England. It is intense for 90 minutes. There is no let up for the whole game. There are more physical demands than in France. You just do not get the time."