More than modular construction, China's import content for its Ships are comparatively low compared to what we have. The delays can be avoided if we can manufacture the propulsion, radars & weapon systems, in India. This will bring down the total time our shipyards take from 6 years to maybe 4 years. But a lot of our warships were commissioned without weapons and or helicopters. Indigenization is the way to go and way to control the cost and cost escalation.I haven't checked it myself, but MDL's modular construction capabilities becoming available and the P-15Bs keel laying began at around the same time.
According to MDL, they said they need 6 years to build a destroyer and 5 years to build a frigate using modular construction. And both P-15B and P-17A seem to be following such timelines.