New Post: Iterating through retweeters

I'm making a contest where the person that has the most retweets wins a prize. And I'm using:

var tweet = Tweet.GetTweet(tweetId);
var retweets = Tweet.GetRetweets(tweet);

But I have a few questions. For example, I'm laso using:

var rateLimits = RateLimit.GetCurrentCredentialsRateLimits();

I'd like to know what the limitations are. Is there a limit of requests I can make per hour? Per tweet? How do these limitations work?

For example, if there's a 60 requests limits. Is it a global limit? Can I make only 60 requests for all tweets as a whole? Or can I make 60 per tweet? And what's the limit refresh time?

Is this method for the REST API 1.1 or for the Streaming API? And do both have the same limits?

Thanks in advance for you're replies. I've been looking for a reliable twitter library for .net and up until now, tweetinvi has been the best one around.