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Curation is a Function of the Square Root of (Accumulated Upvotes + Your Upvote) - Square Root of Accumulated Upvotes, within the range of time 25 - 35 minutes after post is borned.

Yes, clear. So, one should make an upvote within that time frame from the beginning / launch of a post, otherwise, you miss the curation rewards? For example if I upvoted a post which is 4 hours old or 2 days old, I miss on curation rewards?

Maximum rewards are at 30 - 35 minutes after the post is published

Regarding Comments I an not an expert yet. But if someone upvote you, you get 75%, the other 25% goes to the Voter or Curator. I guess the same formula would apply.

Your Upvote = Your Voting Power

Your Voting Power is Proportional to your STEEM POWER