Convert H4 Visa to H1B in case found a job

[jainneha_81]

Hi,

I am in process of applying for H1B Visa. My husband who is in IT field, would accompany me on H4 Visa.
In case he is able to find a job there, how can the H4 Visa to converted to H1B and generally how much time does it take.
Also, if I am on H1B, is my husband eligible to apply for EAD.

Thanks in advance.

Regards
Neha Jain