Jamie Campbell Bower worked almost 24 hours at a time during Stranger Things season 4

He told PEOPLE magazine: "We could be starting at 1am, 2am to get him ready for 8am or 9am. We would have a whole shooting day of, maybe a 10 to 12 hours. Then we would be de-rigging him two hours in the evening.

"By the time they got to the fourth season, the production team was so experienced and so on it.

"Tudor Jones - who's one of the producers on season 5, but he was the first assistant director on season 4 - he scheduled the shoots so cleverly and considerably that we would never shoot Jamie two days on a row."

Gower recalled how everyone would be "exhausted" by the end of the day, but the shoots were scheduled to prevent them working two days in a row.

He added: "We'd have a super long day. We'd be exhausted, which might be on a Monday, but then we might not film again until Wednesday or Thursday. So there would be a full path of recovery,

"It was similar on season 5, but, because our days were not so intense in the makeup chair, we were able to do a few more days back to back."

Vecna has a more streamlined appearance in season 5 which relied more heavily on CGI to create a more damaged look, which meant less time for Bower in the makeup chair.

Gower said: "The way we actually manufactured the makeup was quite different to what we did on season 4. We had different materials and different mold-making procedures. We'd spend about three hours with him [in the chair], max.

"It was a lot easier for him to go to the bathroom this season as well.

"To get it off, there would be three of us taking the makeup off at the end of the day. We'd probably be looking at about 45 minutes to an hour, maybe, to get it off, de-rigged, clean, cleaned up, get some hot towels on him, all clean, send him on his way.

"On season 4, we were probably looking at the best part of about an hour and a half to two hours to get him out of his makeup at the end of the day."