Sherlock fans are used to waiting a long time for new seasons of the show, and season 4 may take just as long to hit the airwaves in Britain and America.

Sherlock just concluded its third season in on Sunday, Feb. 2 in the U.S., but fans clamoring for more might have to wait two years. Steven Moffat, the series' co-creator, spoke with IGN about the fourth season, saying that he had no idea when it would air.

"Sue [Vertue, producer] is working on the schedules right now," Moffat explained. "I just started with [Peter] Capaldi on the new series of Doctor Who. You know, we'll do what we can, but with no sacrifice in quality - that's the thing. If people have to wait two years, they'll have to wait two years. When's the next James Bond film? You know, it's not that kind of show that turns up all the time. It's just not. But the good news is, that probably means it will turn up sporadically for a very, very long while."

The Sherlock Holmes adaptation, which stars Benedict Cumberbatch and Martin Freeman, has become more and more popular over the course of its run. The first two seasons of Sherlock are currently on Netflix Watch Instantly, and the recently-ended third season is still featured in On Demand services through cable companies.

The season 3 finale featured a significant cliffhanger in which [SPOILERS] Moriarty (Andrew Scott) revealed that he was still alive. [/SPOILERS]

Even though it will likely take a while for season 4, Sherlock fans can rest assured that it will at least be around for a long time.

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Sherlock, Sherlock Season 4