Length: 150 characters
A TikTok comment can be up to 150 characters, much shorter than a caption. Keep it to one thought; longer replies work better as a video reply.
Speed: no published number
TikTok doesn't publish a daily comment limit. Commenting very fast, or posting the same text again and again, can get you action blocked for a while. That's also how TikTok spots comment bots.
What this means for bought comments
Bot comments hit these limits and patterns constantly, which is why they get removed. Real comments, written one by one by real people, don't.
Questions
How long does an action block last?
Usually from a few hours to a few days.
Can I comment with only emojis?
Yes, but a few words get more replies.