How long does it take to install security cameras?

Hi this might sound a little stupid but recently I’ve been working part time at a small store and my boss wants me to install fake cameras in our store because the full set of CCTV costs too much. According to the system integrator, we need to set up around 32 cameras to prevent theft. Though that’s a large number, I honestly don’t think dummy cameras wouldn’t help if something happens. So I’m considering pulling those cables and installing the cameras on my own. Has anyone here tried doing so and how long does it usually take?