That tells me that their testing is either extremely excellent , or extremely nonexistent. Rumors seem to point towards the latter, which is concerning for security software.
It should ideally take from a few seconds to a few minutes. That's not extremely excellent, it's just good practice.
More than that and it hints towards heavy reliance on manual testing, and that's something I'd be worried about.
EDIT: Despite the parent comment's misguided logic, it seems his/her fears are actually in the right place.
An issue was opened about 6 weeks ago asking where the tests are and it received zero responses from the maintainers: https://github.com/bitwarden/core/issues/399
Also "a few days" was just a guess. I noticed that it was a problem, then I noticed a few days later that the fix had been release. I don't actually know exactly how long it took to release the fix after it was committed.