In order to not get cut off in a Google search result, what is the maximum number of characters that your title should be?

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In order to not get cut off in a Google search result, what is the maximum number of characters that your title should be?
  A)  60 characters
  B)  30 characters
  C)  90 characters
  D)  120 characters
GA
Gaurav Arora, Digital Media Lead. 10+ years running paid media and tracking for brands in the USA, UK and Canada.