family visit visa ( six months )

sir/madam,

i am coming to qatar next week in employment visa, i want to pick my wife with in next three months,
if i get a 6 month visit visa for my wife ??
what are the requirements for 6 month visit visa ??
what are the procedures ??
how many days it will take for the visa process ??
what are the documents i wnt to sumit ?
kindly describe whole details,

i am waiting for your kind reply (i am an indian )
thanks in advance

best regards
pradeep kuma