Question: When does season 4 of last man on earth?
qaPairs: question: When does season 4 of last man on earth start airing?
answer: October 1, 2017
question: When does season 4 of last man on earth finish airing?
answer: May 6, 2018
question: Over what time span does season 4 of last man on earth air?
answer: October 1, 2017 - May 6, 2018