Is the amount of time for a "tour" standard or does it mean how long you speant in combat?

ranger tours ( i heard ) range from 3 to 6 months. normal army tours are 12 months. does this mean a ranger spends three months in iraq and has done one tour and does this mean that normal army spends twelve months before they have done a tour? or is a tour a set number of months in a combat zone regardless of... show more ranger tours ( i heard ) range from 3 to 6 months. normal army tours are 12 months. does this mean a ranger spends three months in iraq and has done one tour and does this mean that normal army spends twelve months before they have done a tour? or is a tour a set number of months in a combat zone regardless of breaks inbetween? thanks guys. just currious.
Update: so a tour is actualy not a set time but how many times you were sent to iraq? like if you get sent there then come home thats a tour?
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