//.timerignore 21:00 1 1 .ignore -u3000 *!*@*

in aliases
/9pm .timerignore 21:00 1 1 .ignore -u3000 *!*@*

or maybe in remotes:
on *:start: timer9PM_ignore 21:00 1 1 .ignore -u3000 *!*@*