How many years after Abraham was the law given to Moses?
The law was given to Moses approximately 500 years after Abraham was called out of Ur, or 490 years if counted exactly. Abraham's call occurred around 2,000 B.C., and the giving of the law came about 1,500 B.C., roughly five centuries later.
Les explains that Abraham was called out of Ur at 2,000 B.C. Then 500 years later—490 if you want to be exact—Moses led the people out of Egypt, and God gave the law. That places the giving of the law around 1,500 B.C. From that point until Christ at zero was 1,500 years, during which Israel labored under the yoke of bondage. Les notes that this legalism destroyed incentive, because people felt they could not measure up, leading to unbelief.