Where exactly Brooks (Mythical man month) says about 10 lines of code a day?

About Brooks here, I think, all know. The source is here.
I had a difficult and very important discussion, it is necessary to refer to the unquestioned authority. Here here says
Everybody always says that they can beat the "10 lines per developer per day" from the "Mythical Man Month"...

And leaf through the book, can't find it. Someone tell me what Chapter it is discussed?
August 19th 19 at 23:17
1 answer
August 19th 19 at 23:19
Solution
Experience of OS/360 data confirms Harrah, even though the data on OS/360 is not as detailed. In groups develop a management program performance amounted to 600-800 debugged teams per year per person. The development teams of translators productivity has reached 2000-3000 debugged teams per year per person.
pow, page 55
2000-3000 commands/250 working days.
And where is 10 lines per day? It is unlikely that the Americans are working only 120 days a year. - willa.Gra commented on August 19th 19 at 23:22
: corrected response - kadi commented on August 19th 19 at 23:25

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