I think you are referring to the mean time of a
reactor, which is 7 - 8 years which is why I said a plant would start producing power and earning income after 8 years. Plants typically have 2 - 4 units and build of units is staggered so the whole plant takes longer.
Here's statistics from 2022 with the mean being a little over 100 months for a reactor:
As of 2022, the average construction time worldwide for recent nuclear power plants with new designs was double the projected construction schedule.
www.statista.com