Some questions that might help us figure this out:
- What is the total data size of the 110,000 photos and videos? Do they fit into the Creative Cloud storage limit of your current plan?
- How fast are your Internet download and upload data rates? If you divide the total data size of the 110K images and videos by your upload data rate (for syncing up to the cloud) and your download data rate (for syncing down the images you want to edit), remembering to correct for megabytes vs megabits, you'll get a rough idea of how many days it should take.
- What steps did you use? This is important, because if you synced up from Lightroom it will upload originals into the cloud and then Lightroom Classic will download originals back to your local storage, meaning you'd end up with two local copies of the entire set. But if you synced up from Lightroom Classic it will upload Smart Previews (not originals) into the cloud, and that's what Lightroom will sync back down.
The title of the thread sounds like something that shouldn't be done, so some clarification of the goal is in order. Taken at face value, it's setting up the two Lightrooms for major conflicts since they manage images in completely different ways. For example, in your question #2, you can't really use the local copies of your Lightroom (CC) images as the inputs in to Lightroom Classic, because technically, the only local copies that Lightroom keeps after initial sync are cached copies of the originals which are stored in the cloud. And those are stored in a hidden folder because it isn't supposed to be user-accessible. You can "break into" that hidden Lightroom folder and tell Lightroom Classic to catalog it, but because it's only a local cache, the contents and folder structure will constantly change, so Lightroom Classic will complain about missing folders and files all the time. And obviously that computer-managed cache folder structure will not preserve how you might have organized them in your local backup.
You may want to read about the experiences of another professional who tried to go down the same road, as what he said sounds a little like what you're after:
“...what I’m aiming for is to get my entire collection of photos, all 335,731 of them, comprising about 4TB, onto Adobe’s Creative Cloud servers with as little disturbance to my workflow as possible. I want Creative Cloud to be my canonical place for all my photos, but given Lightroom CC’s stripped-down approach, I imagine I’ll still want to use Lightroom Classic for some things.”
What he wrote is sort of a cautionary tale, and he even has friends at Adobe that he talked to about this: Migrating from Lightroom Classic to Lightroom CC, and the Controversy Over Using Them Together: An E.... Basically, you have to think this through very carefully.
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