Is there any wait time to apply H4 EAD once some one comes into US in H4 visa for the first time?

Hello,

Is there any wait time to apply H4 EAD once some one comes into US in H4 visa for the first time? Some are saying that I can apply only after 90 days of their stay in the US.

As you know, not all are qualified for H4 EAD. But, if you qualify for H4 EAD, then you can apply anytime. There is no wait time. Check How to apply for H4 EAD