Zoning is only part of it. If a plot is already zoned industrial, but is empty, you still need to get the permitting for building construction, utility hookup, waste water & stormwater, environmental inspections, etc.

It varies from state to state (and city specific laws), but to go from empty land to productive asset can take several years.

Also for a large enough utility hookup you will need to coordinate with the utility and or government since you can’t just plop down a large consumer on any old power line or pipe.