There is three 40 jubilees in history

 

The first starts from the birth of Seth

Gen . 5: 3] And Adam lived an hundred and thirty years, and begat a son in his own likeness, after his image; and called his name Seth:

From the birth of Seth to the time God called Abraham to sacrifice Isaac was around 2000 years.  Which is 40 Jubilees  that is to say. Forty times 50 is 2000 years.

The second is from Abraham called to sacrifice Isaac.

From the time Abraham was called to sacrifice Isaac to the crucifixion of the saviour was around 2000 years that to say again 40 Jubilees.

The third is from the crucifixion till the rapture

From the crucifixion 30 AD to the end of the church age will be also around 40 Jubilees. From the crucifixion to the rapture will be around 2000 years. We are already 1989 from the crucifixion.