USA 6 months
Canada danne na

Visit visa lesi ne hoda sop ekak liyanna wei
(hoda sop ekak liyanna wei) me kiwa eka therune nehene.
Visa ganna purpose letter ekak liyanna one mchn.gihilla koheda inne mokada karanne kiysla dala
Mata USA wala inna American ekkenek thamai balanna kiwe. Pora support eka dennam kiyala kiwa. Company ekaka CEO kenek. Business seen ekakata.
Poragen letter ekak ehema gaththoth puluwan wei neda
Ah enan tak gala hambei

You normally get 6months to Canada.( In special cases you get more than 6 months. )
If you are in Canada it is easy to extend your visa. But there is a catch. For example let's say you have two years visa. If you stay for more than 6 months you will be flagged. It won't be a problem until you apply again though. Best thing to do is, cross the boarder every 6 months and come back (If you have US visa).
canada visitor visa + biometric fee ~ rs 20,000
Return air fare ~ 150,000
now they are giving multiple visa machan .. but as you have mentioned
only maximum 6 months continuously can stay in Canada. after that have to
go out side of the country and come back. but im not sure how long you have to stay out side of the country.
for an example in Ausi, if you stayed almost 1 year continuously, 6 months you have to stay out side ( parent visa thing )
What do you mean by multiple visa. can you explain that ?
for an example, before last year my father had to apply Canadian visa whenever every time he had to visit. that means whenever he applied before last year they gave only for like 6 months / 3 months etc.
but when he applied back in last year, he got visa for 5 years. so now he doesnt has to apply visa for 5 years. so he can now go to Canada and stays there continuously maximum 6 months. good thing is till 2022 no need of applying visa again
What do you mean by multiple visa. can you explain that ?