It took me several hours to DL and install on my PS4, but in my current house I'm running off of weak wifi so I'm only getting 10MB/sec. If you're wired to your modem or router, it should DL faster.

As for an SSD, I wouldn't. Yes, they do boot faster, but it's really only going to speed up start times etc. Once the game is running, it's very smooth on the standard HD. Also, SSDs have a limited write lifespan, meaning each time you save to it, its life is shortened a bit. So it's really not ideal for a game console that saves regularly.