Content type: Research Paper
A University of California study found that after each interruption it takes over 23 minutes to refocus.
Cite: Mark, Gloria & Gudith, Daniela & Klocke, Ulrich. (2008). The cost of interrupted work: More speed and stress. Conference on Human Factors in Computing Systems – Proceedings. 107-110. 10.1145/1357054.1357072.