*1 Gn15-13 mentions 400 years of 'your children in Egypt'
Ex12-40 mentions 430 years of Egypt

Rashi(Ex12-40a) suggests
- 430 years Total from Abraham in Egypt to Exodus
- 405~400 years from birth of Isaac, Abes child

*2 Rashi suggests that the fact that
- Esauvs marriage was arranged by a BROTHER vs FATHER, ISHMAEL
- seems to imply that Ishmael died then(and Hence brother married)

NOTE: Without this conjecture we know
- Ishmael is 14 years older than Isaac
- Isaac is 60 years older than Jacob
- So we know Ishmael is 74 years older than Jacob

It seems reasonable that all 3 of the following happened together
- Jacob leaves Isaac
- Esauv marries Ishmaels daughter
- Ishmael dies or is dead

That leaves a 14 year gap in Jacobs life (See next note)

*3 The 14 year gap is computed as follows
- we know Jacob 130 when he stood before Pharoh
- we know that the following passed
- - 30 years of Joseph till he advised Pharoh
- - 7  years of plenty
- - 2 years of famine
- - 7 years of working for 2 wives
- - 7 years of bearing children
- Hence Jacob was 77 when he started working for Laban
(You could take off 7 years if you believed Jacob worked
14 years and then got married but there are problems with this)

- We know Jacob was 63 when Ishmael died

- IF we assume Ishmael Died, Esauv married and Jacob left
all at same time we have a 14 year gap in Jacobs life

- It is possible to shorten it but we still have gap

- Reasonable conjecture is to use the OTHER VERSE method
Gn25-22 shows that when Rivkah was in trouble she
went to seek God. Since Rivkah advised Jacob to leave
she probably also told him to seek God. (This is
very reasonable and Rashi adds further details)

*4 This addendum to Rashi was added by the Sifsay Chachamim.
We know that
- The 12 children were born during the 2nd 7 years
- Joseph was born last
- Levi was born third
- So there is a 3 or 4 year difference in age between
Levi and Joseph. This is used to make further
computations on the exile.

We can show that Levi died in year 309 after God appeared
to Abraham. Since the exile lasted 430 years we infer that
there were only 121 years of actual servitude and slavery.

*5 Most of the items in the above list are explicitly stated
However some are conjectural and reasonable
The juxtaposition of Ex01-06:08 seems to say
-------------------------------------------------------------
Joe and all his brothers died ...and a new King came on Egypt
-------------------------------------------------------------
So the exile started AFTER the brothers all died.

Levi died in year 309 which places the servitudes beginning
no earlier than year 309