The number 40 generally symbolizes a period of testing, trial, probation or judgement appearing 145 times in Scripture.
Here are some more interesting references to FORTY:
After the flood waters had receded, and the tops of the mountains were visible, Noah waited another 40 days to open the window of the Ark (Genesis 8:6).
Isaac was 40 years old when he took Rebekah as his wife (Genesis 25:20).
Esau, Isaac’s son, also got married when he was 40 (Genesis 26:34).
Embalming took 40 days in early Bible times (Genesis 50:3).
Moses was on Mt. Sinai for 40 days and 40 nights (twice!) (Exodus 24:18)
(Exodus 34:28)( Deuteronomy 9:9,11,18,25)( Deuteronomy 10:10).
The spies that Moses sent to spy out the Promised Land were there for 40 days (Numbers 13:25)(Numbers 14:34).
One of those spies was Joshua, and he was forty years old when he went
(Joshua 14:7).
Moses died when he was 120 years old (Deuteronomy 34:7). His life can be divided into 3 sections of 40 years: (first 40) being born and growing up in Pharaoh’s house in Egypt (Acts 7:20-23), (middle 40) fleeing to Midian after killing the Egyptian, and living there for 40 years (Acts 7:29-30), (last 40) returning to Egypt, the exodus, and the events that followed
(Acts 7:36)(Exodus 7:7).
Aaron died 40 years after the Israelites had left Egypt (Numbers 33:38).
Three different times in Judges, the land had rest for 40 years
(Judges 3:11)(Judges 5:31)(Judges 8:28).
Eli judged Israel for 40 years (1 Samuel 4:18).
Ishbosheth became king over Israel when he was 40 years old (2 Samuel 2:10).
Three kings reigned for 40 years: David (1 Kings 2:11)(2 Samuel 5:4-5), Solomon (1 Kings 11:42), and Joash (2 Chronicles 24:1)(2 Kings 12:1).
(Saul may also be a part of this group [Acts 13:21], but this is controversial
[1 Samuel 13:1].)
The 10 lavers in the Temple each held “40 baths” (about 230 gal.) of water
(1 Kings 7:38).
The time period between Jesus’ resurrection and ascension was 40 days
(Acts 1:3).
The book of Exodus has 40 chapters.
The average length of a woman’s pregnancy is 40 weeks.
Lent is the 40 days before Easter (not counting Sundays).