Or HaChaim on Genesis 29:7/אור החיים על בראשית כ״ט:ז׳

1 ויאמר הן עוד היום גדול, He said: "The day is still long, etc." The reason that Jacob presumed to judge their actions was that he was concerned with unnecessary suffering of the animals (compare Baba Metzia 32). He also wanted to find out if the reason they delayed watering the flocks was because this was not the proper time and that the town was far off and these animals were used to be kept in the town overnight. This interested him because it would help him determine the distance he had travelled. He learned from the shepherds' answer that what they did was not related to the distance from Charan.