Depends on what you consider the start date. Practically speaking there’s some investigation into building nuclear in Italy that already occurred but using that as a start date isn’t meaningful here. Similarly the announcement you point to was a long way from having everything required to actually build a power plant.
Until there’s actual funding talking about nuclear doesn’t really mean anything. Vogal was a boondoggle but it didn’t get construction approval until 2012 and like many projects ran into COVID delays on top of everything else.
> These projects always go overbudget, badly.
Using the worst examples means there’s something very wrong with each of them.
> Vogal was a boondoggle but it didn’t get construction approval until 2012 and like many projects ran into COVID delays on top of everything else.
Well there you are, then: projects experience delays in construction approval and run into other unexpected delays, which extends a ~10yr estimate.