Doc Freemo 
A supernova takes course over only several weeks to a few months. So very very short time indeed by stellar standards.
@freemo @rivetgeek @georgetakei inside the star, are nuclear reactions involved in the creation of lead?
@freemo @rivetgeek @georgetakei
How long, on average, does it take a star to go nova?
From its formation as a star, as a starting point?
Do we have any idea?
@SethBrown @rivetgeek @georgetakei
Varies greatly on the mass of the star and its composition (generation).
@freemo @rivetgeek @georgetakei
Are we talking more than 4000 years, by chance?
Or is it ever possible that a star could go nova within 4000 years and spray lead across the universe?
Just to eliminate lead formation within a star as a possible source of lead on the earth, as something which could possibly have happened within 4000 years ... ?
Not always, there are types of supernova events that can happen over the course of days. For example in binary star systems that just finished forming you can have super nova events occuring due to the interaction between the stars.
That said I am not arguing that the earth is 4000 years old, only that the argument made here is invalid.
