Determine if the sentence is true based on the text below:
Matt Smith played the Doctor in the series The Eleventh Doctor over a period of 47 months.

The Eleventh Doctor is an incarnation of the Doctor, the protagonist of the BBC science fiction television programme "Doctor Who". He is played by Matt Smith, in three series as well as seven specials, over an almost four-year-long period. As with previous incarnations of the Doctor, the character has also appeared in other "Doctor Who" multimedia.
It's impossible to say