How long does it take to switch from the Guard to Active Duty? (New enlistee)

Couple of things.
1) You need to talk to an active duty recruiter to make sure you are eligible. That is generally the first step.

2) If you are eligible you must apply for a conditional release from the National Guard (DD Form 368). This is not automatic and will be subject to Arkansas's enlisted numbers as of this time. If they are below strength it will be much more difficult than if they are above.

Other than that, if you aren't released, you will have to wait until your initial enlistment is up and then talk to an active duty recruiter as you get close to your ETS date.

Don't get upset if you are told no initially. You have to understand that you signed a contract and the state of Arkansas just spent a lot of money sending you to basic and possibly AIT.

Good luck though!

Side note: You are a 42A and they are a highly used MOS for AGR (Active) in the Guard. It is similar to active duty in that you are paid active duty pay+BAH based on your rank but you still work for the National Guard.

Please keep in mind that it is the Guard paying for your training, not big Army. Also, once you get to your unit do not act like you don't want to be there or gripe about how you'd rather be Active. Also, how the heck do you even know the Guard isn't for you? What specifically is it that you don't think is a good fit for you?

Things to keep in mind: Your unit has to agree to release you AND you need to have an Active unit that has a slot for you as well.

SSG Slover is correct, you will need to turn in a completed DD 368 & a 4187. The ARNG must approve this form for you to go to active duty. When I was in recruiting, I did get a couple split options from the guard, and they were released prior to going active duty. Keep in mind, Units and States can have different policies in regards to releasing members. "Typically" guard members need to be in their units for a minimum of 6 months after completion of training. An Active duty recruiter should know what the policies are for getting members released. Some scenarios where there have been exceptions to policy is if the service member was in a hardship type of scenario financial hardship. If you really wanted to push the issue and obtain a release, write your congressman. It's an extreme measure, however I have seen it work as well.