H4 Visa Stamping from Canada

[tech2012]

Hi

I have H4 Visa and I have approval petition (H1B Petition) and I visit to canada to meet my brother. Could you please let me know how easy will get H4 Visa from Canada ?
What is the process for apply US H4 Visa from canada ? Like (1 day or 2 Day process - India have 2 day process)

Please let me know your experience and whole process from beginning or email me


thanks