How Long Will the iOS 11.1 Update Take?
The iOS 11.1 update will be much larger than iOS 11.0.1, iOS 11.0.2, and iOS 11.0.3 so expect it to take a bit longer to download and install.
We can't give you an exact size, but given what's on board, expect iOS 11.1 to be several hundred megabytes at least. The first iOS 11.1 beta was nearly 2GB, so was the fourth iOS 11.1 beta.
If the previous iOS 11 updates are any indication, you can expect iOS 11.1 to take a couple minutes to download over high speed Wi-Fi and 5+ minutes to install.
Your exact download and installation time will be based on your device and your current version of iOS.
If you're upgrading from something older than iOS 11.0, your iOS 11.1 installation will take a little bit longer because it will include features and fixes from the iOS updates you missed.