SAUGERTIES, N.Y. — Joe Sinnott says spider webs drive him crazy, even though he has been drawing them for over 50 years for one of the world’s most famous superheroes.

“They’ve got to be so accurate, and they’ve got to be the same all the time,’’ he said. “It takes me about three days to do two pages.”

At 90, Mr. Sinnott still brings to life the action tales spun by Stan Lee, the co-creator of Spider-Man, continuing a collaboration begun in 1950 when Mr. Sinnott first went to work for Mr. Lee at what later became Marvel Comics. “Imagine having the same boss for 67 years,” Mr. Sinnott said. He added that they should be in the Guinness World Records book.

With pen and brush, he keeps Spider-Man flying over New York City, soaring from skyscraper to skyscraper, in a never-ending battle against supervillains. “It just takes time putting all those lines, and the tiny spider on Spider-Man’s chest, in such a small space,” Mr. Sinnott said.