@rj2390
All Google Nest cameras and doorbells have some sort of hard-coded cooldown period, during which additional notifications are not sent. It apparently varies between 1 minute to 30 minutes, depending on the type of event and the camera. Last year a Google Nest Support person posted a chart of the cooldown periods in a response in this forum, but their post was soon deleted.
In June 2021, Google posted this response on Amazon: "In general, Nest cameras have up to 10 minutes cooldown period for Person alerts, and up to 30 minutes cooldown period for Motion alerts. Cooldown period is for sending alerts only, there’s no cooldown period for activity detection. Because Nest attempts to send the right number of alerts at the right times, the camera will trigger a short cooldown period each time a notification is sent. Nest strives to give our customers only the most important information, when it’s important. Because of that, the length of the cooldown period fluctuates according to our research on what our customers find useful and important. Your camera may notify you when it first detects activity, but it shouldn’t send additional notifications as the activity continues. While the duration of the cooldown period can vary by alert type (person, sound, motion, etc.), the behavior remains the same." (https://us.amazon.com/ask/questions/TxU6P8E9XWAY6J/ref=ask_ql_ql_al_hza)
