Assuming also that one voxel is 32 bits and not compressed, then the hologram would be 435,600 bytes per frame per cubic inch. At 24fps (you did say "film") that's 10,454,400 bytes per second per cubic inch.

Let's say it projects a hologram to fill a room the dimensions of a Star Trek-style holodeck, a cube of maybe 10 metres on a side. That's about 400 inches on a side, or 64,000,000 cubic inches. That means that a holographic film would be 669,081,600,000,000 bytes (608.5 terabytes) per second.

So, to answer your question, a 2 hour holographic film would be 4,817,387,520,000,000,000 bytes (4.178 exabytes) in size.