More likely none. You need to accept that your business is the marketing of your product or service, not the performance of your product or service. Let me say that again - your business is the marketing of your product or service, not the performance of your product or service. Outstanding products or services can exist in a failed business if you don't continuously market to existing and potential customers. New hires will fit in their job from day one.
New hires come with knowledge, skills and abilities.
They do not have a context for the use of those knowledge, skills and abilities in a new position. Even if the new hire has vastly superior knowledge, skills and ability, they need orientation into the specific context of the new job. Accept this from day one and you will save time and prevent frustrating a new employee. Conduct business by your business plan. Only at the start.