How many years between Abraham and Joshua?

The time of Abraham (in The Bible) was estimated by scholars to be some time between 2000 BC and 1850 BC. Abraham died at the age of 175 years. (Gen 25:7), which would be between 1820 BC and 1675 BC.

Biblical scholars calculated the time that Joshua led Israel into land of Canaan around 1240 BC at which time he would have been around 60 years old (ca. 1300 BC). Joshua died at the age of 110 (Joshua 24:29).

So, between the death of Abraham and the birth of Joshua was about 400 years.