A couple questions regarding slot leader election

  1. What time exactly do the slot leaders for an epoch get elected? (UTC time)

  2. Are all the slot leaders for an entire epoch selected at this time?

  3. Whats the penalty for your stake pool being offline during an epoch? I read somewhere that it takes 4 hours of online time before your stake pool becomes active again and therefore you are only obligated to be online for at least 4 hours before the slot leaders are selected to be included during the selection process. Is this true?