50-100% more time.

Shared
Inboxes
A shared inbox is a full-fledged inbox. It has a separate Inbox, Drafts, and Sent Items.
Every email sent to the shared inbox — can be seen by users with access to the email account.
When replying, users can change their ‘send as’ field — to send emails from the shared inbox address.
The moment a user deletes an email, it will be deleted for everyone.
Google
Groups
Google Groups are groups of email recipients with the same email address.
The same message is reproduced for everyone on the list — and they receive it in their individual inboxes.
The users can only use their personal address and not the Google Group email address.
When one user deletes an email, it does not affect others’ inboxes.
Shared
Inboxes
A full-fledged inbox with Inbox, Draft, etc.
Everyone accesses the same email - in the common inbox.
Replies can be sent from shared inbox id.
Deleting an email deletes it for everyone.
Google
Groups
A group of users with the same email id.
The email is reproduced for users - and sent to their personal inboxes.
Replies can only be sent from personal email id.
One person deletes - does not affect others.
Use Google Groups to manage a shared email address like info@ or support@?
Not a great way of doing things
Turn your Google Groups into shared inboxes with Hiver — and manage them right from Gmail.
Interface
Assignment
Visibility
Team discussions
Hiver helps you manage Google Groups right from Gmail
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