Useful caps to remember:

Limit	Typical value
Message text	500 characters
Broadcast text	500 characters
Message cooldown	A few seconds per recipient
Nickname	32 characters (plain text; markup stripped)
Spotlight max display	About 4–60 seconds, default 30; after audio ends, ~2s hold then ~1s fade
Important ambient (opt-in)	Free 5 / Personal 15 / Power 40 / Creator 100 per UTC day
Important silence	About 20 minutes default after ambient speech (play receipt + live push)
Quiet hours live speech	Only interrupt priority; whisper / normal / urgent wait
Sponsored channel post	Creator plan; 100 + 2×live credits (quote at send)
React preview display	Initial ~3–120s (default 10); after each reaction ~5–120s (default 30)
Reactions	One emoji per person per message/broadcast (changeable); short rate limit
Webhook message	500 characters
Webhook signature window	About 5 minutes
Missed announcements	Stay unread in Messages for manual replay
Broadcast throttle	Minutes per community (shorter on higher plans)
Personal reminders	Up to 50 per account (active + paused); recurring cadence at least 5 minutes
Webhooks	Free 1 · higher on paid plans
Owned channels (slots)	Free 1 · Personal 3 · Power 5 · Creator 15 (private feeds count; Notes does not)
Channel follower caps	Free 1,000 · Personal 1,000 · Power 2,500 · Creator 10,000 (the owner counts)
Credits included	Free 500 once · Personal 500/mo · Power 1,100/mo · Creator 3,000/mo
Telegram channel voice/audio passthrough	About 60 seconds max

Exact plan allowances for messages, included credits, and webhooks are always shown on Premium. A connected agent can read your plan and the room left (channel slots, messages) with the get_account_limits MCP tool.