How long does it take for macos internet recovery?

As noted, subject to your internet provider's speed. it should be between 30 and 60 minutes to do the download. Then another 30 to 45 minutes to install with several automatic restarts. You have a problem and need to reinstall. I strongly recommend only using a wired Ethernet connection, not Wi-Fi as it is slower and often gets errors due to the large size of the download.

Ronasara wrote:

I strongly recommend only using a wired Ethernet connection, not Wi-Fi as it is slower and often gets errors due to the large size of the download.

FYI, if a user needs to use wired Ethernet, then they should make sure to use a Thunderbolt2 to Gigabit Ethernet Adapter instead of a USB to Ethernet Adapter. The USB-A adapter will be extremely slow and should be avoided.

As far as I know, it takes around 30 min. or so, though it depends on Internet connection speed you have.