Likelihood of rate limits/IP ban from Twitter?

I'm currently trying to use snscrape to download Tweets from Twitter. According to my calculations, I should be getting around 2,200,000 Tweets in total by the time it finishes. I'm concerned about the possibility of getting IP banned from Twitter as a result of this. Is this something worth being concerned about, or should I not worry?

More generally:
- How much scraping should be safe to do before worrying about getting rate-limited or IP banned?
- If the concern of getting IP banned is valid, do these bans typically go away after a period of time, or are they permanent, etc?

This tool seems like a godsend, compared to the limits of the official Twitter API. Having a more solid understanding of the "safe zone" would make me feel more comfortable with using it. I know that maintainers can't *guarantee* anything about rate limits or IP bans, but if anyone has experience with where they begin to set in, knowing that would help a lot!