08/07/03=10%
08/08/10=20%(38days)
08/08/25=30%(15days)
Avg 26.5 days
My Guess:
08/09/20=40%
08/10/17=50%
08/11/12=60%
08/12/10=70%
09/01/01=80%
09/01/28=90%
09/02/23=100%
So 4-6 months...

Opps:Sorry...