Open Gmail and hover your mouse over an email that you want to snooze. You will see a little clock icon. Click it and you will see a few preset options for how long the email should be snoozed. You can set a custom option by clicking Pick Date and Time. You will get a calendar and a time field where you can select how long i.e. what day and at what time you want to be reminded of the message.
Source: How To Snooze Emails In Gmail