Will any one tell me now how much time the canadain high commission take and when i go for interview
Ahha! Welcome to the board Sweet heart

I'd say, Borrow a clock! those down to earth (Quite literally) visa officers will rub their pencils to its tail playing tic-tac-toe for about few weeks. Then when they'll realise that bunch of files for next quarter are knocking on the door, they'll have youcalled inn, Interview may go somewhat like..
Visa Officer: So, have you ever been to islamabad before?
You: Yes.
Visa Officer: Its nice down here, Do you like it?
You: Yes.
Visa Officer: Can you spell l'hexakosioihexekontahexaphobie (Slipping a piece of paper and left over pencil with no tip left)
You: there you go (writes l'hexakosioihexekontahexaphobie)
Visa Officer: Excellent! we'll write you in few days about the next step, but could you please give us a favor by asking your husband to provide us proof that he'll not chicken outta this? (See the translation below)
(Universal Translator: Ask your spouse to provide affidavit of support, Financial one, along with tax return filed for last 2 years, three most recent pay stubs and proof of residence and other crap)
You: (while clearing sweat!) I can indeed.
Visa Officer: Great, Also if you could bring a box of pencils next time, that'll help us a lot.
You: errrr... Come again?
and so on....
and before you know! well sorry, you WILL know, in a month time or so, they'll send over a letter asking for the same preposterous, form which brought brain wrenching pain while you were filling them out an year ago for your application. Utterly bonkers!

But then, One day, you'll find the delivery guy, very gently pressing teh doorbell with the intention of never to take his finger off the button. asking you to give some money so he can give you an envalop that'll have a remedic al request, and if your spellings in the interview were right, a passport request too.

glad I could be of any help.