Onboarding/KYB friction for prop firms – what's the real cost?

Been looking at the prop firm space a lot lately, not just from an internal ops perspective but also as a potential funding source for some promising traders we're bringing up. The KYC/KYB hoops are obviously there for good reason, but I'm curious what kind of operational drag others are experiencing. Are we talking days of back-and-forth for each new trader, or have some of you found truly efficient workflows that minimize that 'human touch' friction? Especially interested in how this scales when you're looking to onboard dozens, maybe hundreds, a month.