Question: How long did the career span last for what English actress who starred in the British stage play The Deep Blue Sea?

Context paragraphs:
Azurite: Azurite is a soft, deep blue copper mineral produced by weathering of copper ore deposits.  It is also known as Chessylite after the type locality at Chessy-les-Mines near Lyon, France.  The mineral, a carbonate, has been known since ancient times, and was mentioned in Pliny the Elder's Natural History under the Greek name "kuanos" (κυανός: "deep blue," root of English "cyan") and the Latin name "caeruleum".  The blue of azurite is exceptionally deep and clear, and for that reason the mineral has tended to be associated since antiquity with the deep blue color of low-humidity desert and winter skies.  The modern English name of the mineral reflects this association, since both "azurite" and "azure" are derived via Arabic from the Persian "lazhward" (لاژورد), an area known for its deposits of another deep blue stone, lapis lazuli ("stone of azure").

Güzelyalı, Çanakkale: Güzelyalı is a seaside village in Çanakkale Province of western Turkey.  It is 15 km from the Çanakkale city centre.  Güzelyalı is surrounded by deep green woods with pleasant pine smell in the east and by the Çanakkale Strait (the Dardanelles) with its completely deep blue sea in the west.

The Deep Blue Sea (play): The Deep Blue Sea is a British stage play by Terence Rattigan from 1952.  Rattigan based his story and characters in part on his secret relationship with Kenny Morgan, and the aftermath following the end of their relationship.  The play was first performed in London on 6 March 1952, directed by Frith Banbury, and won praise for actress Peggy Ashcroft, who co-starred with Kenneth More.  In the USA, the Plymouth Theater staged the play in October 1952, with Margaret Sullavan.  The play with Sullavan subsequently transferred to Broadway, with its Broadway premiere on 5 November 1953, and running for 132 performances.

Deep Blue Sea (soundtrack): Deep Blue Sea is the soundtrack to the 1999 science fiction thriller film "Deep Blue Sea".  It was released on June 27, 1999 through Warner Bros.  Records and consisted of hip hop and R&B music.  The soundtrack didn't find much success, only making it to #55 on the Top R&B/Hip-Hop Albums.  The lone single was LL Cool J's "Deepest Bluest", but it was unsuccessful to make it to any Billboard charts.  LL was quoted as saying "This was my finest shark-related song ever.  I can't believe it didn't chart."

Saffron Burrows: Saffron Domini Burrows (born 22 October 1972) is an English-American actress and former model.  Burrows has appeared in films such as Circle of Friends, Wing Commander, Deep Blue Sea, Gangster No. 1, Enigma, Troy, Reign Over Me and The Bank Job.  On the small screen she's starred as Lorraine Weller on Boston Legal, Dr. Norah Skinner on My Own Worst Enemy, Detective Serena Stevens on .  She currently appears as Cynthia Taylor on Amazon series Mozart in the Jungle.

The Deep Blue Sea (1955 film): The Deep Blue Sea is a 1955 British drama film directed by Anatole Litvak, starring Vivien Leigh and Kenneth More and released by Twentieth Century Fox.  The picture was based on the play of the same name by Terence Rattigan.  Rattigan's play has also been filmed by Terence Davies with Rachel Weisz in the Vivien Leigh role of 'Hester' and Tom Hiddleston as 'Freddie'.  The movie tells the story of a woman unhappy in her passionless marriage leaving her husband for a younger and more ardent lover.

The Deep Blue Sea (1954 TV film): The Deep Blue Sea is a 1954 British TV play based on the play by Terence Rattigan starring Kenneth More, reprising his role on stage.

From Wishes to Eternity: From Wishes to Eternity - Live is a live DVD/VHS/CD by Finnish symphonic metal band Nightwish.  It was recorded in Tampere, Finland on 29 December 2000.  The CD was released as a limited edition of 10.000 copies, available only in Finland.  In late 2005, Spinefarm managed to release it in Europe.  In addition to a show of Nightwish material, the band also performed a medley, "Crimson Tide, Deep Blue Sea", which borrowed melodies from Hans Zimmer's music in the 1995 film "Crimson Tide" and Trevor Rabin's music in the 1999 film "Deep Blue Sea".

Peggy Ashcroft: Dame Edith Margaret Emily Ashcroft, DBE (22 December 1907 – 14 June 1991), commonly known as Peggy Ashcroft, was an English actress whose career spanned more than sixty years.

The Deep Blue Sea (2011 film): The Deep Blue Sea is a 2011 British romantic drama film directed by Terence Davies and starring Rachel Weisz, Tom Hiddleston, and Simon Russell Beale.  It is an adaptation of the 1952 Terence Rattigan play "The Deep Blue Sea" about the wife of a judge who engages in an affair with a former RAF pilot.  This film version is funded by the UK Film Council and Film4, produced by Sean O'Connor and Kate Ogborn.

Supporting paragraphs: The Deep Blue Sea (play) Peggy Ashcroft
Answer: more than sixty years