ninja — pull request #513 by fifoforlifo (2013-03-04 03:46:59+00:00)
Title: Adding elapsed time (%e) to NINJA_STATUS.

I found having elapsed time to be a useful realtime indicator in NINJA_STATUS. I do the following now:
NINJA_STATUS=[%s/%t - %e]

On windows it also helps since there isn't a always a handy 'time' shell command.