Delay execution within a batch file for a specified number of milliseconds with the free open source sfk sleep command for Windows, Mac OS X and Linux.

sfk sleep msec

delay execution for a number of milliseconds.

web reference

usage example:

   start sfk sleep 3000 +tail -f logs\access.log -pat "GET * 404 "

      creates an error log viewer, and runs apache in parallel.
      sfk will wait 3 seconds before tail goes active.