Noah and his family were ‘all adrift’, far above the earth, but the Lord remembered them.
God repeated the command to Adam to multiply and fill the earth. God made a covenant with both man and beast to never again use a flood to destroy the entire earth.
This chapter traces the lines of Japheth Shem and Ham, beginning with Japheth.
The parallels and contrasts with Acts 2 are clear. When the 120 disciples were all together in one accord, in one place, seeking the baptism of the Holy Spirit.
The opening verses speak of strange marriages on earth between beautiful young women and non-human beings that produced offspring of unusual strength and fame.
We are not told how long it took Noah and his sons to build the ark. Yet we could reason that it was arguably 100 years at most and probably less.