conversations.from: human
conversations.value: Mark has to wait 4 days for his first coronavirus vaccine appointment. Then he has to wait 20 days for his second vaccine appointment. Then he has to wait 2 weeks for the vaccine to be fully effective. How many days does Mark have to wait in total?
  Give me a detailed solution.
conversations.from: assistant
conversations.value: 2 weeks have 2 weeks* 7 days per week = 14 days
  Counting the days until the first and second vaccine, and the days to the vaccine to be fully effective, Mark has to wait 4 days + 20 days + 14 days = 38 days