Actually, this situation is pretty strange because you can post almost every second,
There are so many factors are play, that any number you are given is meaningless. If posting 5, then as long as you are not posting 5 in a time frame that a human could not do it doesn't really matter
increase posting frequency until something bad happens.
do 1 less next time.
You can get away with at least double that. Posting isn't considered a very spammy action. Even on Instagram you can get away with posting 10-20x per day without issues (if you do it manually ofc).
How many posts do you need?
Actually, this situation is pretty strange because you can post almost every second, but don't abuse it. Also, make sure your mail, etc. is verified and the profile is fully filled.
i dont think its about how much a human could do, e.g. a human could easily follow 100 accounts in a day with 1 account, however this'd get the account blocked. not all penalties are aimed at bots but simply misdemeanors
moreover, twitter lets one get away with spammy actions for a few days sometimes, however if those spammy actions are done every day, account will face lock