Basically I'm looking at the effort remaining to factor all exponents to 999M to 70 bits

I defined the lower bound as 30M but since all exponents from 30M to 100M are already at 70 bits I am only looking at the 100-999M ranges.

My spreadsheet takes the numbers from:

http://www.mersenne.ca/status/tf/0/0/2/0
I've been ciphering and have a few months of stats now....since the above report has been accurate and complete:

1. I take the number of exponents currently at each bit level below 70;

2. I calculate the GhzDays to take those to the next bit level. To make it manageable I:

-- use the GhzDays to TF the 'mean' exponent up 1 bit level

-- multiple the count by that number

-- and 'ass-u-me' that range will average out

3. Calculate the expected number to be factored and carry the remaining to the next bit level column

4. Continue up to to 70 bits.

And here is a 3-month summary:

Code:

66-Exp 66-Days 67-Exp 67-Days 68-Exp 68-Days 69-Exp 69-Days Total-Days
Aug-24 8,762,562 351,170 14,371,316 1,135,950 16,599,700 2,491,221 16,636,680 5,019,375 8,997,716
Sep-30 7,931,520 312,019 13,685,155 1,103,546 16,485,174 2,473,561 16,527,300 4,987,211 8,876,337
Oct-30 6,996,815 275,606 13,337,018 1,086,349 16,373,884 2,457,974 16,405,450 4,946,490 8,766,419

The 66-Exp is the current number of exponents at the 66 bit-level.

The 67-Exp is the current number at the 67 bit-level plus the expected exponents to move up as un-factored from the 66 bit-level.

At the current linear rate of 100,000 GhzDays per Month we have over 7 years to go....Moore's Law to the rescue.