It is a huge cube. I once printed a model that size, but totally hollow, no infill only 2 perimeters (.8mm walls) and 80mm print speed and it took 24 hours.
So with infill, those very thick walls (1.2mm), and 50mm is kind of a slow print speed for an UM. Yes, it is probably
spot on. You could speed it up slightly by reducing the wall thickness to .8mm. Increase print speed, increase infill speed higher. You could try pushing the layer height to upper .2's or low .3's with possibly a higher than usual temp to compensate for the larger amount of plastic.
Forcing the printer to run faster is tricky, and can result in a half print. Just so you know.
Larger prints like this need a larger nozzle size so you can do a much larger layer height.