My iPhone not backing up to iCloud. Taking too long. Says 11 hours to complete backup. I have 2TB iCloud storage.

Hello and welcome to Apple Support Communities, Docajaygupta,

We understand you're having trouble completing an iCloud backup. We'd be happy to provide information to help you out.

Check to see that you are connected to Wi-Fi. The amount of time it shows to complete a backup depends on your Internet speed. Check these other steps to see if they help:

If you can't back up to iCloud - Apple Support

Regards.