Debian "Bullseye" contains 1,152,960,944 lines of code. (Source: https://sources.debian.org/stats/ )
You can fit 34 lines on a page of A4, meaning 33,910,616 pages.
Using 310 micron paper & a duplex printer, a printout of the source code would be 5¼km tall.
And cost about £200,000 in toner and another £200,000 in paper.