I myself believed Job lived during Abraham's time. Several facts lead me to believe this.............
1. Job lived more then 140 years.
Job 42:16 After this lived Job an hundred and forty years, and saw his sons, and his sons' sons, even four generations. - This was not a uncommon life span during Abraham's time.
2. The economy of Job's time was measured in livestock
Job 1:3 His substance also was seven thousand sheep, and three thousand camels, and five hundred yoke of oxen, and five hundred she asses, and a very great household; so that this man was the greatest of all the men of the east.
3. Like Abraham, Isaac, and Jacob, Job was the priest of his family
Job 1:5 And it was so, when the days of their feasting were gone about, that Job sent and sanctified them, and rose up early in the morning, and offered burnt offerings according to the number of them all: for Job said, It may be that my sons have sinned, and cursed God in their hearts. Thus did Job continually.
4. The main reason I think this is because of the absents of any reference to the nation
Israel, or the
Mosiac Law this suggest a pre-Mosaic date.
Wait for it..............................
This means Job lived, before 1500 B.C. as historical facts go..............