The track day organization itself has a lot to do with it, as does the rider themselves.
The org that I work for is VERY newbie friendly. We spend a lot of time "catering" to the first-timer, walking them through everything that they're going to do that day, making sure they understand all the rules etc, spending extra time with those that need it, etc.... As long as ALL basic controls (throttle, clutch, brakes, shifting and turning) are feeling "second nature" so that you don't have to conciously think "Okay... where are the front brakes again? Where's the clutch? Where's the shift lever?", and you are able to safely pilot a motorcycle under normal riding conditions, that's typically enough.
As far as MY personal experience, I started riding with that same organization 3 months after I started riding & I only had 5k miles of riding experience.... and that was PLENTY of experience for me. (I even scuffed a puck a few times that day
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