Building 21 in Call of Duty: Warzone 2 DMZ is Open for 24 Hours

As an avid Call of Duty player and content creator, one of the most common questions I‘ve been getting recently is "how long is Building 21 open in DMZ?" As you may know, Building 21 is a mysterious new location added to Warzone 2‘s Danger Zone extraction mode that houses exclusive loot and objectives. However, it is only accessible for limited periods.

Specifically, Building 21 is open in DMZ for 24 hour periods before going on cooldown where it cannot be accessed.

This unique approach to limited-time availability makes securing the rewards inside Building 21 an intense and competitive experience for the CoD community whenever it opens up. In this article, we‘ll take a closer look at the schedule, purpose, and gameplay impact of Building 21‘s 24 hour accessibility windows.

What is Building 21 in Call of Duty: Warzone 2?

Added in Season 1, Building 21 is an entirely separate map from the main Al Mazrah region in DMZ. Players must find special keycards to open this off-site office complex location. Inside awaits lucrative contraband loot, including the chance to extract a permanent weapon blueprint.

However, Building 21 also houses dangerous AI enemies and hazards to survive. With permanent weapon loss possible in DMZ, it is very high risk to attempt infiltrating Building 21 when access becomes available.

Based on various player reports, Building 21 seems to frequently open up for 24 hour periods on weekends, usually Saturday mornings around 9 AM PT. However, the exact schedule remains irregular.

Building 21 Open and Close Periods

Here is a summary of some reported Building 21 open and closed dates:

As you can see, there is no set cadence for when Building 21 becomes accessible. However, the windows consistently seem to last 24 hours before closing again. This means if you have a DRC Building 21 Access Keycard, you have an entire day to take advantage of this opportunity.

The Psychology and Gameplay Impact of Limited Availability

Why would Activision add Building 21 as a location that is only occasionally available? I believe the developers intended for its irreular open periods to accomplish a few gameplay goals:

• Create urgency and excitement around the community when Building 21 opens due to fear of missing out (FOMO)
• Encourage competitive play for the 24 hour window as players rush to grab the exclusive loot
• Provide a repetable end-game activity for dedicated DMZ players grinding for contraband
• Mimic the random loot opportunities of "extraction shooter" genres like Escape from Tarkov

We‘ve seen other games utilize limited-time events before to drive up engagement. Having Building 21 frequently open and close makes accessing it feel more like an episode or carnival attraction. There‘s a risk it may not appear again for days or even weeks after it closes!

Personally, I don‘t mind this model for end game content even though it may frustrate some players. The 24 hour duration gives enough time to organize a squad and develop a gameplan to infiltrate Building 21 when notified it is open. And when that coveted access keycard drops from a supply box, the elation knowing you can participate is a huge rush!

Of course, others in the community argue this artificial scarcity feels manipulative rather than fun. Players have no guarantee when Building 21 may open again if they miss their chance to access it during one activation window.

Tips for Gaining Entry to Building 21

If you still need a DRC Building 21 Access Keycard, there are a few ways to acquire this rare item in DMZ:

• Complete DMZ missions and open reward chests
• Loot rare orange chests that spawn dynamically
• Complete public events when they occur
• Extract helicoptor supply drops from clearing SAM sites

I recommend playing DMZ regularly regardless if Building 21 is currently closed. This will allow you to stockpile weapons, equipment for your loadout, and continuously earn keycards from by finishing matches and missions.

That way, as soon as Building 21 opens again for a 24 hour period, you’ll be notified and prepared to infiltrate this high risk, high reward location in DMZ! It is unclear if future Warzone 2 seasons may change the availability model of Building 21, so be sure to take advantage of the unique challenge while you can.

Let me know if this breakdown helps explain the temporary nature of Building 21 and how to make the most of the 24 hours it is open in DMZ! As a dedicated Call of Duty expert and content creator, I am happy to provide analysis or clarification. Feel free to ask additional questions in the comments section below.