Yes, it saves our time:
1. We can easily search emails by just writing the subject name or the person's name whom emails we want to search.
2. We can search for emails and view them later when we need it
3. Some email features like quick message saves a lot of time for conversation
4. Can send email to faraway places where moving might be way too difficult
5. Email can be categorized to find important emails like job applications or friends' emails etc
6. We don't have to go to places to deliver our important files and media
7. People can watch email if they missed voice call in their preferable time