Minimum stay on H4

[Bob7]

Hi,
I am married recently and my wife will be joining me shorthy.
she is currently has H4 visa and I am planning to get her H1-B processed as soon as she is here.
Is there any time limit she has to be on H4, inorder to start the H1 process.
Suggestions, replies appreciated.
Thanks,

[leifbooger]

No time limit on H1b. You can file immediately.