...will the Canadian Companies wait for 1 month for the newly recruited to join them....?
Very very unlikely -- unless u r joing them as a Sr. Manager... and that too in a direct permanent position.
What I'm implying is that our 1st jobs would come against 'contractual offers', or 'temps. for leave vacancies', or in a lower position -- and employers [usually] would be in a hurry to fill those vacancies.
Yes, there's some sort of relief days... but it's not likely to be beyond a week or two, in most cases. Nonetheless, as
Pippin opined - there's no harm in negotiating a bit; and if u r 'the' candidate - some leverage might be offerred.
Hope u got the point!
Qorax