KYB for Legal Entities in PSPs: What's the longest anyone has experienced?

I'm currently considering changing the main PSP for my company's transactions. I've encountered issues with the KYB (Know Your Business) process, where some providers take a very long time. It's not just about complete documentation, but it seems to be stuck in their internal processes, or sometimes they request documents back and forth, wasting time. Currently, some providers have taken almost two weeks and are still silent. I'm not sure if this is normal for large PSPs.

I'd like to ask friends in the industry: what's the longest KYB case you've encountered in business days for a legal entity with a somewhat complex structure, such as having multiple directors or subsidiaries that need to be considered? And are there any PSPs whose process is relatively smooth and takes less time than average?