H1B Stamping (COS from F1 to H1B) in Canada

[QuestionV]

I am currently working on OPT in the USA. My employer applied for H1B which has been approved this month. I am planning to get my H1B stamped in Canada in October this year. This will be my first H1B stamping.

I have a couple of questions:

1) How much time does it take to get H1B visa stamped in Canada? I want to plan the time off accordingly for the Canada visit.

2) What is the difference between getting the visa stamped in last week of September (when I will be on Cap Gap OPT Extension) versus getting the visa stamped in first week of October?

Any help will be truly appreciated. Thank you,