Lifespan 1000 years to 80?

[Drich]

basically it all boils down to counting the major events to signify planting and harvests which again could happen several times a year.

In short we don't know.

So when the bible talks about events lasting days or months, they are not days and months as we understand them either?

"And the ark rested in the seventh month, on the seventeenth day of the month, upon the mountains of Ararat."

When would the 'seventh month' have been do you think? If a year was not a year, a month must have been something else also. What was it?

No as we understand a day it starts at midnight.

For the Jew it starts when the sun can no longer be seen (sun Down.)

A month for us can be as short as 28 days or as long as 31.

A month for a jew alternated between 29 and 30 days (based on a lunar cycle) meaning a New moon started a new month.

(which is why hanukkah and pass over start at different times on our calendar every month.)
the years are based on 12 or 13 months (leap month)
Also their year starts somewhere between march and april.

http://www.jewfaq.org/calendar.htm

This is how their calendar works now (since the exodus) before then it was far more complicated.