What is being said about AF is also true for army. All the gears of land forces like tanks and artillleries take almost an year to be produced in a significant numbers. Whereas they would be consumed within weeks. You also need to keep in mind that in a full blown war these manufacturing units would be one of the first target of enemies. Hence chances are you won't be able to produce more even you want to.
So China will bomb the factory in Tamil Nadu? With what? A nuke?
Consumed within weeks? How so? You do realise for any war to last years, it takes into account that the Chinese have failed to successfully invade even a few hundred meters into our territory, with both having mounted a very successful air defence campaign, so how will the Chinese take out artillery that's located tens of kilometers inland?
With every passing second, you are losing out on logical reasoning.
As for infantry, I don't have any problems if a war is fight with them only, even for ages. But that too would end quickly thanks to modern automatic rifles and explosives. Then you will need significant amount of workforce to produce tons of ammunitions which would be used by that force, And there are other factors too like feeding and providing proper clothing. Forget about protection as you won't be able to produce enough BPJs and BHs for them. Above all you would need to keep the economy going.
Modern rifles, explosives, or anything modern the infantry carries cannot finish war quickly.
Millions of rifles, BPJs, helmets, clothes, boots etc can be produced every month, forget every year.
You don't need significant amounts of manpower for any of this. Just 200 people will produce 70000-100000 AK-203s in India per year. If a person assembles merely 20 rifles a day for 365 days, he will have produced 7300 rifles. Put a 1000 people on this task, you get 7.3 million rifles in that same year. Pretty much the same with everything the infantry uses.
This discussion is going nowhere. Simply a waste of time.