(CBS) – The hands on the office clock always seem to move a little slower on a Friday afternoon. Especially during the summer. Outside, it’s gorgeous, and the last place anyone wants to be is stuck inside an office, waiting for 5 p.m. to finally start the weekend.

But last weekend, graphic designer Jim Doussard kicked things off a little early. He just didn’t show up on Friday. Instead, he spent the day at his summer home in Maryland, tinkering in his garage … building clocks, instead of watching one.

“I love to be in my studio,” he said. “It’s borrowed time, if you will. I don’t owe the office any more time that week. I don’t owe my family, my friends. I can just go in my studio and create and just be me.”

Doussard wasn’t playing hooky. He was encouraged to take the day off by D.C. architecture firm HOK. After working slightly longer hours Monday through Thursday, Doussard was able to take advantage of an increasingly popular perk: a “Summer Friday.”

“A summer Friday is when companies let their employees leave early on Fridays during the summer,” said Brian Kropp, HR Practice Leader at research firm Gartner. “We’ve just seen a huge increase in the number of companies that are offering it.”

Gartner’s recent survey of Fortune 1000 companies found that 42% offer some type of “Summer Friday,” up from 21% just two years ago.

“The companies that have made the decision to give this benefit are giving it every summer because they see it’s valuable,” said Kropp.

Companies like L’Oréal, whose corporate headquarters shuts down at 1:30 p.m. sharp between Memorial Day and Labor Day. The beauty company has been allowing its New York City employees to beat the weekend rush out of the city for the past two decades.

Summer Fridays are a tradition that’s thought to have started in Manhattan advertising and publishing firms back in the 1960s. But now, employers across the country — from shoemaker Nike in Oregon, to boat engine maker Mercury Marine in Wisconsin — have started offering a version of the perk.

And it’s not just out of the goodness of their hearts.

“What they found is, by giving their employees a little bit of time back and giving them that gift of time, they like their employer much more,” said Kropp. “They actually become much more loyal. They work harder. They’re more committed to their organization. It really shows that their employer cares about them and wants them to have a great work/life balance.”

The worker bees in Erica Thum’s colony need tending to, and it’s a chore this landscape architect is only able to accomplish on her occasional Fridays off. Her hobby is honey.

“I’m going to take that day to weed the garden, and check on the hives, see how the queens are doing, and pull some of the honey frames, and do some extracting,” Thum said.

When she’s at the office, she sits a few desks away from colleague Oliver Vranesh, who uses hisbonus hours to hang out with his little sister. One Friday at a time, he’s been writing a children’s book for her.

Right about now, I’m sure many of you have started writing a “Why don’t WE get summer Fridays off?” email to your bosses.

And that’s kind of the point.

Knighton said to Vranesh, “I assume you have friends at other companies, other industries, who don’t have this perk?”

“Oh, yeah. I like to just brag it in their face all the time, if I can!” Vranesh replied.

Take a peek on Instagram and Twitter on Friday afternoons, and you’ll see happy employees gloating about their bonus hours. It’s a perk that can be used as a recruiting tool.

“The big idea here is that work/life balance has become so much more important for employees nowadays,” Kropp said. “It’s one of the biggest reasons why people join one company. It’s one of the biggest reasons why they quit their current company.”

Perhaps no company loves Fridays more than TGI Fridays. The Dallas headquarters of the restaurant chain looks like a party starting at 2 p.m. on a Friday, no matter what season it is.

“It’s invaluable time,” said Caroline Masullo. “It’s all year long. Every Friday. I think we’ve started calling it Endless Fridays now!”

Masullo is VP of marketing (and on “Endless Fridays,” the company DJ). After an hour of cocktails, everyone — including the CEO — heads out the door.

Out on the lake, Masullo is able to get a head-start on the weekend with her family.

Knighton asked, “If it was a Wednesday afternoon at this time, where would you be?”

“At work,” Masullo laughed. “Probably driving home from work, sitting in traffic, so this is a nice change for sure.”

Since Friday afternoons are typically the most unproductive part of the week, giving this time doesn’t necessarily cost companies that much. But the return can be priceless.

“I think it’s less about the three hours of time, and more so (at least for me) it says something about this brand and the way that they value individuals’ personal time,” Masullo said.

It’s worth noting that Summer Fridays are a perk mostly reserved for white collar workers. The staff at TGI Fridays restaurants certainly don’t get the afternoon off.