@echo off
:waitFor
setlocal enabledelayedexpansion
set "sleepFor=%~1"
call :currentTime startTime
:: Note, dont use a for loop, the cmd prompt would try to expand each iteration, and that is a big problem
:loopStart
call :currentTime curTime
call :getTimeDiff result !startTime! !curTime!
set /A timeDiffMs=!result!*10
if !timeDiffMs! GTR !sleepFor! ( goto :return )
set /A timeRemaining=!sleepFor!-!timeDiffMs!
if !timeRemaining! GTR 1200 ( timeout /nobreak /t 1 >nul 2>&1 )
goto :loopStart
:return
endlocal
goto :eof
:currentTime
setlocal
set "curTime=%TIME%"
:: For some stupid reason if the hour < 10, it uses a blank space instead of a leading zero
if [^%curTime:~0,1%]==[^ ] set "curTime=0%curTime:~1%"
endlocal & set %~1=%curTime%
goto :eof
:getTimeDiff
setlocal
set "startTime=%~2"
set "endTime=%~3"
set /A startTime=(1%startTime:~0,2%-100)*360000 + (1%startTime:~3,2%-100)*6000 + (1%startTime:~6,2%-100)*100 + (1%startTime:~9,2%-100)
set /A endTime=(1%endTime:~0,2%-100)*360000 + (1%endTime:~3,2%-100)*6000 + (1%endTime:~6,2%-100)*100 + (1%endTime:~9,2%-100)
set /A duration=%endTime%-%startTime%
if %endTime% LSS %startTime% set set /A duration=%startTime%-%endTime%
endlocal & set "%~1=%duration%"
goto :eof
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т.к. запись вида: 
