I would say it honestly depends on your hustle and the time it takes to "know yourself", if you will. I.E. your results may vary.
If you KNOW you can do this daily (or whatever you decide your schedule to be) with actual enjoyment, you can kill it right out the gate. On the flipside, if you are even the least bit insecure, it can show on your first broadcast and it can wear you down very quickly. So first and foremost, you HAVE to know your limits to be successful, both mentally and physically.
Granted, everyone has their bad days, but if you can get up and build your confidence and keep that beautiful radiance you have, you'll be a supahstar in no time, bb.
/tangent
BUT to directly answer your question, it took me a month to replace my vanilla job.