But it's like what Jeff Head said it is China's first time building a complete aircraft carrier so it is generally going to be expected that it'll take a bit longer than say 002 and while I'm definitely not an expert in shipbuilding I would generally assume that building a destroyer and building an aircraft carrier will be different so the workers/builders will have somewhat of a learning curb.
Well, most of the problems would happen in the design phase. China has a proven military shipbuilding capacities. For welders and welding engineers it doesn't matter if they are in charge of welding steel modules for an aircraft carrier or a destroyer etc..