Do I need extraction or IRP?

extraction vs IPR?
Ans: remember IPR is not substitute for extraction. when proclination or crowding is moderate to severe in that case extraction [space gaining ] is required to retract teeth. normally we use IPR for mild space creation or to break tight contacts. many doctors do severe IPR in all teeth to gain space but that is not advisable.

HOW MUCH TIME WILL IT TAKE?
Ans: that depends on what treatment option you choose? , as duration is concern for you, so best option for you is invisalign treatment. its invisible way to align teeth and treatment is also very fast as compare to braces.