According to the UNSW's Time Management Institute, not saying goodbye when you leave a party can actually save you up to two days per year.
Yes, this might sound rude but researchers have found that saying goodbye at a party generally can take up to 45 minutes. And because an average person goes to around 25 parties per year, a person might be spending an average of 18 hours and 45 minutes each year saying goodbye to others while leaving.
The report found that those who say goodbye are forced into repeating the same excuses multiple times for different people as why they're leaving the party early. This costs them more time than someone who sneaks out without saying byes to everyone.
Also watch: Tips to get over that hangover