Context: Most feature movies shown during the prime time and early overnight hours (8:00 p.m. to 2:30 a.m. Eastern Time) are presented by film historian Robert Osborne (who has been with the network since its 1994 launch, except for a five-month medical leave from July to December 2011, when guest hosts presented each night's films) on Sunday through Wednesday evenings – with Osborne only presenting primetime films on weekends – and Ben Mankiewicz presenting only late evening films on Thursdays, and the "Silent Sunday Nights" and "TCM Imports" blocks on Sundays.

Question: What is the time period covered by prime time and the early overnight?
Answer: 8:00 p.m. to 2:30 a.m. Eastern Time

Question: Who presents films on TCM on Wednesday nights?
Answer: Robert Osborne

Question: What is Robert Osborne by profession?
Answer: film historian

Question: Why did Robert Osborne stop presenting films on TCM for several months?
Answer: medical leave

Question: Who presents Silent Sunday Nights?
Answer: Ben Mankiewicz

Question: Who presents films on Eastern on Wednesday nights?
Answer: Unanswerable

Question: What is Eastern by profession?
Answer: Unanswerable

Question: Why did Robert Osbourne stop presenting films on Eastern for several months?
Answer: Unanswerable

Question: Who presents Silent Sunday Nights?
Answer: Unanswerable

Question: When was Ben Mankiewicz on medical leave?
Answer: Unanswerable