Los Angeles: Pop star Madonna says that working on her directorial debut "W.E." was not fun because it became "all-encompassing".

The 52-year-old wrote, produced, cast and directed the movie and found it to be incredibly difficult, though she learned a lot from the experience."I researched and co-wrote the screenplay and I cast the film and then I produced it because I couldn't find a suitable producer in time before shooting, and then I had to direct it within 52 days," Madonna said.

."It was not fun at all. It was all-encompassing and gut-wrenchingly hard and very educational," she added. "W.E." won the best original song - motion picture at the Golden Globes ceremony on Sunday for the number "Masterpiece".