Greetings thaw32,
Thank you for using Apple Support Communities. It seems like iOS update is requested, but won't say how long is remaining. We would recommend you use this article for more information. We'd like to specifically call out this section/information.
"If the download takes a long time
You need an Internet connection to update your device. The time it takes to download the update varies according to the size of the update and your Internet speed. You can use your device normally while downloading the update, and your device will notify you when you can install it. To improve the speed of the download, avoid downloading other content and use a Wi-Fi network if you can."
If your iPhone, iPad or iPod touch won’t update
Please don't hesitate to let us know if the steps resolved your issue or if you need additional assistance.
Take care.