Just wondering if

1. Is a company obligated to fire someone who is being complained about in regards to sexual harassment?

2. If so, how long do they have? Assuming the complaint was documented, investigated, and the employee was found guilty of it.

3. Can you sue a company for not firing someone if they were found guilty of it?
So, if there is no time limit for the employee to be fired, then how would I know the appropriate time to seek an attorney after filing a complaint with my employer?