latin american spanish? how long does it take?

hey people could you plzz help me by telling me how long it would take me to learn spanish in a latin american country if i was
1. staying with a host (native) family
2. going to learn spanish at a school
3. not being able to assosiate with english speack people as much

plzzzzz could you help thank you and could no one leave any stupd comments cos if you dont like my question move on to another one thanks people..

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