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Yeah, the LOCs in one of the biggest banks in the world is close to 10M (including: Trading[eq & ficc] , Credit, Mortgages, Wholesale, Wealth Management, Quant, Risk, and also UIs, tests , reports , recons, interfaces) , I don't think a task like that was given to single person, usually with that base of code a big IT consulting company is hired.

99M loc for dealing with timezones. Before it was a library call.

And they knew what they were doing.