How long is the initial backup of 1TB?

I set up a backup with QNAP "HBS3 backup & sync". I'm trying to back up 1TB for the first time.
-- First 12 hour it did 46% -- It's been 6 hours since then, but now is only at 53%...
Backup options: (1) backup to Google Drive (2) client side encryption (3) these (default) compression settings (see attachement)

Question: Is it normal it takes so long?

The answer is 36 hours for 1 TB. But probably dependant on connection speed etc.