When covered shipyards can speed warship construction

How much would covered shipyards accelerate ship construction before World War II?

They improve weather control, but conventional slipways, large cranes, rail access, and growing ship size limit the gain unless construction also shifts toward indoor modular assembly.

Covered yards protect work from weather, but prewar ships were assembled on large ways served by overhead cranes and rail systems while hull dimensions kept increasing. Enclosure becomes much more valuable when paired with modular construction that moves repeatable assembly work indoors before larger sections reach the slipway.