How long does ipadOS 17.0.3 take to install

The time required will be determined by many factors, including but not limited to:

• how much data must be restored
• the speed/throughput of your internet connection
• the speed/throughput of your WiFi network
• server loading; Apple’s regional update servers may be busy

The only aspect that you may be able to directly influence is your WiFi network. You should note, however, that the slowest item in the chain will ultimately be the limiting factor.

It differs, depends on your internet connection. Here it took a minute or 10