Use the snooze button in Gmail to keep on top of your workload. If you don’t have time to read or respond to an email, press the snooze button and choose a time or date that suits you to remember to respond.
Note that the snooze option is only available if Conversation View is enabled.
Hover over the email you want to snooze
Click the clock icon labelled Snooze to the right hand side of your inbox
Choose a time and date from the drop down
You can also customise the snooze to a particular time and date.
Snooze multiple emails at the same time by selecting the emails and then follow the snooze process.