set /a end_hour=16
set /a end_minute=30

:loop
rem echo off

call :checktime
if %time_elapsed% equ 1 goto :done
rem ping 127.0.0.1 -n 360 > nul
timeout /t 300 /nobreak > nul
goto loop

:checktime
set /a hour=%time:~0,2%
set /a minute=%TIME:~3,2%
echo The time is %hour%:%minute%
echo waiting for %end_hour%:%end_minute%

set time_elapsed=0
if %hour% gtr %end_hour% ( set time_elapsed=1 )
if %hour% equ %end_hour% ( if %minute% geq %end_minute% (set time_elapsed=1 ) )
EXIT /B

:done