What’s six years between friends?!

That’s how long Finn Wolfhard and Billy Bryk have been working on “Hell of a Summer,” their “Friday the 13th”-style summer camp massacre thriller opening Friday.

The duo, who co-wrote, co-directed, co-star and co-produced, began, Bryk, 25, said in a joint Zoom interview, “When we met on set of ‘Ghostbusters.’ We talked so much about films and films we love.”

“Friday the 13th,” which launched a 12-film franchise, a TV series and tons of merchandise, “inspired us,” Bryk said. “It was really exciting to meet Finn who had a lot of similar sensibilities and then a lot of similar aspirations, in terms of filmmaking aspirations.”

“We love the summer camp setting and the feeling of those ‘Friday the 13th’ films,” Wolfhard, 22, added. “But at the same time, we didn’t want the movie to feel like a parody or a satire or be too meta or self aware in that way. It really was kind of a coming of age teen ensemble comedy. Set at a slasher camp, taking the elements we love from those movies.

“But trying to tell this coming of age story because of all these other films that really inspired us: like ‘Rushmore,’ ‘The Graduate,’ ‘Super Bad,’ ‘Dazed and Confused,’ ‘Fast Times’ — all these amazing movies!

“Then being like, ‘Okay, how can we now incorporate a story like that into something that feels like we’ve seen tons of times before but bring our own fresh spin to it, by just trying to tell another story within that sort of context?”

“It was a pretty smooth collaboration,” Bryk said. Even though their writing process never meant being in a room together.

“I guess a lot of it was on FaceTime and Zoom and stuff like that. Usually we’d be just talking about the script and then one of us going off and doing a scene,” Wolfhard recalled. “I would text Billy and then you would just kind of go off and do it. So sometimes we were together, sometimes apart.”

“It’s really funny,” Bryk added, “because I feel sometimes I get the most productive amount of work done on my own. But there’s something so valuable I found in just talking about the script with Finn.

“Frankly, I loved just joking around and messing around with him. We’d run a million ideas by each other and make all these jokes, almost purposefully side-stepping the writing process out of, like, a weird, self-described destructive procrastination.

“Then, in the middle of the night, all those conversations that we had would be swirling in my head. Something would click for me, I’d wake up in the middle of the night and start writing. So it was a funny process.”

“Hell of a Summer” opens Friday