Second phase of H1B

[visacase]

I am about to end the first 3 years of my H1B visa. Before how many months should I ask my company to renew my application for the next 3 years?

 

[ginnu]

I am about to end the first 3 years of my H1B visa. Before how many months should I ask my company to renew my application for the next 3 years?

one can file H1 extension before 6 months of I-94 expiry date.
OR
H1 extension must reach USCIS BEFORE I-94 gets expired.