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were intended to be. We are okay to print if
1. We don't have a completion time estimate yet; or
2. We have passed the last completion time estimate; or
3. The estimated time remaining differs from the last one printed by more
than 3 minutes, and the difference accounts for more than 5% of the
estimated total time.
The problem was that the last printed time remaining was calculated not as
difftime(last_est.tv_sec, last_print.tv_sec), but as
difftime(last_est.tv_sec, now->tv_sec). In other words it was constantly
changing, and at the same rate as the estimated time left (if the scan was
progressing at a constant rate). That means that as soon as a completion time
estimate was fairly accurate, you would not get any more estimates because the
difference in the two times would always be small.
Here is some documentation for Nmap, but these files are much less comprehensive than what you'll find at the actual Nmap documentation site ( http://nmap.org ).