Time for updating a whatsapp or mobile no. On a wordpress website ?

I have changed the calling and whatsapp no. On the wordpress website but it still shows the previous no.
So How much time does it take to update on the website?
Its possble only after crawling ?

It much be the cache of the website that stored and the reason you are watching the same changes
Try to clear the website cache with the plugin or by the Cpanel (some gives the option to clear the website cache from the back) and review it from the other browser or by the devices