batch file - Make "the matrix" Run for a few seconds? -

i have code:

:set @echo %random%%random%%random%%random%%random%%random%%random%%random%%random%  goto :set 

but how make runs few seconds? , how change variable?

i %time% current time , parsed current second. did on each iteration of loop. if desired time has not spent on loop, (defined loopduration) continue next iteration.

echo off  :: set loop duration set /a loopduration=2  :: starting second set "startingtime=%time:~6,2%" set /a startingtime=%startingtime%  :set      echo %random%%random%%random%%random%%random%%random%%random%%random%%random%      :: current second     set "currenttime=%time:~6,2%"     set /a currenttime=%currenttime%      if %currenttime% lss %startingtime% (         set /a currenttime=%currenttime% += 60     )      set /a timepassed=%currenttime%-%startingtime%   :: if desired time has not passed, continue loop if not %timepassed% equ %loopduration% (goto :set) 

edit:

i checked special case here stephan. in case, if startingtime has value of 59 or close 60, currenttime have value less startingtime. checked simple if statement:

if %currenttime% lss %startingtime% (     set /a currenttime=%currenttime%+=60 ) 

so there no possibility currenttime less startingtime. unless want loop run more 59 seconds.