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they allot us 10 year visa
What do you mean Have they already given you a 10 year multiple entry visa.

There is no guarantee how long a visa might be valid for as will depend on how your application is assessed and will not be valid beyond your passport expiry date. You could get a single entry visa valid for one visit or multiple entry.

Still though unless someone is on a study permit or temporary work permit so just a visitor maximum stay would be 6 months each visit as a visitor regardless of the validity of the visa