M113 into an M113A3? Stripped to the hull and introduced into the assembly line. Whatever time it takes to assemble an M113A3, a week, two weeks, or just a few hours? I have no idea.
If it is not a fundamental change to the hull like a large turret, would not say much more.
A lot of things are done, then the equipment is shipped to the Ally so the Ally completes the Mod to their specs. Like radio mounts, weapons mounts, fording gear, night vision, etc.
The Ally fits it to meet their supply chain.
The Leopard and the M113 are similar, NATO standard but, National specific models.
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