‘The Masked Singer’ Has Longest Day of Production Ahead of Final Round

“The Masked Singer” is making history even before the big season finale … with the cast and crew pulling off a nearly 24-hour day of production.

Our ‘MS’ sources say the final day of filming broke the show’s record for the longest production day … starting with a 6 AM call time, and wrapping up around 2:30 AM!

We’re told, the crew pulled out all the OT stops to go out with a bang this season — like adding all the lighting, extra stage prep and pyrotechnics into an already packed schedule.

The marathon production is gearing up for the last round of competition where 3 final costumed celebs — Prince, Firefly and Ringmaster — will square off for the ultimate title. And, we’ve learned, the competition is more fierce than ever.

On top of already having a time-consuming day, we’re told the mystery performers wanted extended rehearsal time with vocal coaches and choreography teams … ahead of the final, winner-take-all round.

Of course, ya also gotta add in some production bumps along the way. We’re told the crew had to add some last-minute safety precautions to the costumes.