I 129 is denied? what will be the probability of winning the case if i challenge?

I 129 is denied, If i challenge what will be the probability to win the case and also pls let me know what will be time frame taken to get to know the results???

The chances depend on the reason, why it was denied int he first place.

It was denied since my employer did not demonstrated clearly the employer-employee relationship.

Earlier we got an RFE on Employer-employee relationship.
Appreciate your response.