How fast can my WhatsApp bot send messages to one customer?

About one message every 6 seconds to the same customer, with a burst of up to 45 in 6 seconds. Go over it and you get error 131056. Wait and retry.

• This pair rate limit applies to messages from your number to one customer, about 10 a minute.
• Error 131056 means too many messages went to the same number in a short time.
• Wait and retry. You can still message other customers without waiting.
• Overall speed is separate: up to 80 messages a second by default, and up to 1,000 by automatic upgrade.