More than a third of millennials recently polled said they’ve taken time off without telling their boss, writes BI’s Kelsey Vlamis.

Starting your vacation a bit early without burning a full day of PTO isn’t an entirely new concept. Let those who haven’t left work early to catch a flight or avoid traffic cast the first stone.

Remote work has supercharged the concept, though. Employees have gotten strategic about scheduling messages or keeping their statuses active, even if they’re only working on cocktails and a good tan.

Which brings us back to WFH Fridays. As summer approaches, it’s not hard to see employees leveraging their remote privileges to get a jump start on weekend travel plans. Driving to the shore during Friday rush-hour traffic is a special kind of hell.

But how far will employees push it? Because let’s be honest, they’re going to push it.

What starts as cutting out a few hours early on Friday suddenly turns into missing the whole day. Do you know the best way to beat Friday traffic? Leave Thursday night!

That evolution might be tough for companies to stomach. We’re still a long way from fully adopting four-day workweeks.

The end result could be employers saying abuse of WFH Fridays means they need you back in the office… for good.