TN Visa general valid period and what type of visa is required for spouse

[sbondada]

Hi There,

I am a Canadian Citizen. I am planning to get a job with TN visa, generally how long is this TN visa is valid? My wife is in India and she has Indian Citizenship. After I get my TN visa, what visa is required for my wife to join me in USA? How long it will take to get her visa?

Who can apply the visa for my wife? me or my employer?

Thanks in advance,
SBondada