Question: Cap Stubbs and Tippie was a syndicated newspaper comic strip created by the cartoonist Frances Edwina Dumm, was a writer-artist who drew the comic strip "Cap Stubbs and Tippie" for how long?

Context paragraphs:
All in Sport: All in Sport was a syndicated newspaper comic strip created in the late 1940s by the cartoonist Chester "Chet" Adams, who earlier had drawn the "Gigs and Gags" feature during World War II.

Napoleon and Uncle Elby: Napoleon and Uncle Elby was a popular syndicated newspaper comic strip created by Clifford McBride.  Over a span of 29 years it was distributed by three different syndicates to both American and foreign newspapers.  By the mid-1940s, the strip was carried by 80 newspapers.

Cap Stubbs and Tippie: Cap Stubbs and Tippie was a syndicated newspaper comic strip created by the cartoonist Edwina Dumm.  At times the title changed to Tippie & Cap Stubbs or Tippie.

The Born Loser: The Born Loser is a newspaper comic strip created by Art Sansom in 1965.  His son, Chip Sansom, who started assisting on the strip in 1989, is the current artist.  The strip is distributed by United Features Syndicate.  The Sansoms won the 1987 National Cartoonists Society Humor Comic Strip Award and the 1990 Newspaper Comic Strip Award.

Luther (comic strip): Luther is an American syndicated newspaper comic strip published from 1968 to 1986, created and produced by cartoonist Brumsic Brandon Jr. The series, about an African-American elementary-school child, was the second mainstream comic strip to star an African-American in the lead role, following "" (1968-1974), the first to do so.  Another predecessor, "Wee Pals" (1965- ), featured an African-American among an ensemble cast of different races and ethnicities.

Alec the Great: Alec the Great was a syndicated newspaper comic strip created by Edwina Dumm and featuring a dog character, as did her other comic strip, "Cap Stubbs and Tippie".  It ran from 1931 to 1969.

Mutt and Jeff: Mutt and Jeff is a long-running and widely popular American newspaper comic strip created by cartoonist Bud Fisher in 1907 about "two mismatched tinhorns".  Historians regard "Mutt and Jeff", originally titled "A. Mutt", as the first American newspaper cartoon published as a strip of panels, as opposed to a single panel, making it the first "comic strip" to successfully pioneer that since-common format.

Luann (comic strip): Luann is a syndicated newspaper comic strip launched by North America Syndicate on March 17, 1985.  "Luann" is written and drawn by Greg Evans, who won the 2003 Reuben Award as Cartoonist of the Year.  The strip is currently syndicated by Universal Uclick.  In 2012 Greg Evans' daughter Karen began co-authoring the strip.

Edwina Dumm: Frances Edwina Dumm (1893 – April 28, 1990) was a writer-artist who drew the comic strip "Cap Stubbs and Tippie" for six decades and is also notable as the nation’s first full-time female editorial cartoonist, She used her middle name for the signature on her comic strip, signed simply Edwina.

Dennis the Menace (U.S. comics): Dennis the Menace is a daily syndicated newspaper comic strip originally created, written, and illustrated by Hank Ketcham.  It debuted on March 12, 1951, in 16 newspapers and was originally distributed by Post-Hall Syndicate.  It is now written and drawn by Ketcham's former assistants, Marcus Hamilton (weekdays, since 1995), Ron Ferdinand (Sundays, since 1981), and son Scott Ketcham (since 2010), and distributed to at least 1,000 newspapers in 48 countries and in 19 languages by King Features Syndicate.  The comic strip usually runs for a single panel on weekdays and a full strip on Sundays.

Supporting paragraphs: Cap Stubbs and Tippie Edwina Dumm
Answer: six decades