How long does it take to load a 6gb--7gb backup before the backup process actually begins?

Hello StefPowers,

Thank you for reaching out to Apple Support Communities.

The amount of time it takes to finish your backup would depend on your backup size and internet upload speed. These steps may be able to help:

"If your iCloud backup is taking longer than expected to complete

1. In iOS or iPadOS, go to Settings > Wi-Fi. Check that you're connected to Wi-Fi. 
2. Check your upload speed.
3. Leave your device connected to power and Wi-Fi for 24 hours. If your backup still isn't done, archive important data then contact Apple Support."

More details can be found here: If you can't back up to iCloud

If the issue persists, can you provide a few more details? Have you tested on another network? Are you receiving any errors? Also, have you backed up your device to iCloud previously?

Cheers!