Icinga database : recommended age for entries in icinga.icinga_notifications table

Hi Icinga2 devs,
quick question:

How old should the entries in the database table icinga_notifications be?

I have disabled icinga housekeeping task, as my table is quite large so I can manually execute it, but I’m curious on how old the app expects entries to be there
(1 day old?, 1 week old?)

Notice that my Icinga server is configure to repeat notification every 30 minutes.

Best Regards,