Firebird what I did was looked at over 25 start up
Post# of 96879
and compared their improving global alexa ranks to when
they achieved 1M users of their product.
Although the differences were wide, on average the
global rank was about 50,000 when they had 1M users
of product.
Then I looked at all the data points we currently have
for how the UF global rank is proceeding in comparison
to what our best guestimates of what UF users have been
along the way and are now,
( I'm guestimating close to 350K-450K now ) and projecting
that trend forward it shows when the global rank hits
35000 then we should have a confirmation of about
1M users at that time.
Hopefully we will reach that point by Q4 2016.
Remember NTEK has already officially PR'd they expect
UF to hit 1M mark this year as well.