If you’re using Outlook then you’ll be familiar with the ability to set up a notification system for when you’re out of the office. There’s also a way to do this in Gmail.
To do so, head to the settings page in Gmail. On the very first tab, down the bottom of the page, you should see the ability to turn the vacation responder on or off.
When you turn it on, you’ll have the ability to leave a message for whoever emails you, along with a subject line. Just choose the date when you want the message to end, or turn it off manually when you’re back.