jesse
Touchdown! Greaser!
As far as an endorsement, I don't think any reasonable CFI is going to sign you off without first being certain you can do well. That means three to five hours of ground time with that CFI.
Actually the online test program I used required that you complete all the lessons, take 3 practice tests in a row with a 90% of higher, and they would provide you with an endorsement. Those numbers might have varied but they would do it without ever talking to you.