γ = speed doubling time
t = time
t0 = year processing was started
T = processing time with constant cpu speed starting at t=0

solving gives This is minimal for
The duration of the calculation will be
Or, when
This has the following result:
CPU speed Doubling time years current estimated calc time years When you don't like waiting:
Wait for years Finished in years When starting now, finish in years

When however the calculation is started at t=0, running at ever increasing CPU speeds: The # operations per second performed as function of t
Where C is the current number of ops/sec
The total number of operations needed to complete the calculation is T*C
So for determine minimal ending time So This is minimal for t0=0, giving