I looked this up and the least number of games Hazard played for Chelsea in the league over a season was 31. He was there 7 seasons.
In all competitions it was 43. He wasn't an injury prone player by any stretch. I was surprised to be honest. Once he went to Madrid that changed dramatically.
Yeah - never injured at Chelsea, but also was never actually that good at producing the goods compared to his reputation and the money he cost. He averaged a goal OR assist every 140 minutes, which is about average for a top side's main creative/goal scoring threat (Nunez, for example, this season is on one every 132 mins - and he has been wasteful and has had many people think we overpaid etc). In fact, he only ever got under a goal/assist every 130 mins ONCE in his entire season there - his last, where he was quite obviously putting in extra effort to get a move to Real (and even then it was only a goal or assist every 94 mins).
Thing is, even when Hazard has played, he has been AWFUL for Real, so they only play him if their other first choice players are injuredor need a rest - he has 4 goals and 6 assists in the equivalent of 27 full games in the league!