If it's per map then we can go to Edit > Map settings and make a mass change to the notifiers on that map. You can click the reset notifier button and make all of the devices on the map not use a notifier. When the time is ready, you can reapply them on the same window, but if you have multiple notifiers it could be time consuming.
There is also Edit > Server Settings > Notifier List > selecting the individual notifier will allow you schedule a window where no notifications can launch. This one might be too much work as well if you have lots of different notifiers.
I can create an ER asking for a snooze option that applies to notifers on the server and specific to maps. Otherwise, if you have any specifics let me know and I'll write it up based on that.