How often does the iPhone calendar subscription renew?

Question

iPhone

I gave another person a link to my calendar of the form webcal://p09-calendars.icloud.com/published/ит.д.
He also has an iPhone.
But if I add an event to myself, then it does not appear immediately. Although if you remove the calendar task and start it again, it appears.
Actually the question is, how often is the calendar updated?
There are a lot of things in all sorts of FAQs from Apple, but not about the frequency of updates.

Answer 1

Approximately 1 time per hour. But it is not exactly.