delay data on api : "List the people from an event by Email"

Hello,

I would like some information about this endpoint:
https://{defaultHost}/events/{id}/people GET

I noticed that when I register someone for the session, and I tested this endpoint within a minute with the email address used for registration as the second parameter. (same result without email, because i can't see the user in data return)

The API returns an empty result:
{
"data": [],
"meta": {
"current_page": 0,
"previous_page": null,
"next_page": null,
"record_count": 0,
"page_count": 0,
"items_per_page": 0
}
}

I can see that they are registered correctly because if I try to register them a second time with the email address, the API returns a 409.

How long does it take for the data to be updated on this endpoint?

Thank you for your clarification.

best