Hello Nishit i have received some updates from production team and site admins,

do not need notifications building up in header area as long as the notification system works and we receive updates about latest numbers available and this is very crucial as mentioned. As per notifications they can be flashed after 5-10 days and site working fast. Same for emails once fresh updates sent emails received and responded and notification related emails can be cleared after 5-10 days.

Hope it helps;)
Cheers