How long does it take to receive a National Guard Enlisted Affiliation Bonus?

It'll take about 90 days once process starts.

Talk to your Retention NCO. They can look it up in GIMS.

Should be about 90 days, give or take a month.
What is *supposed* to happen is that it is an automatic entry and processes once confirmed that you are in position and sometimes (if that stipulation exists) qualified.
Murphy's Law says things don't always go that way.
I've had to submit perhaps one in five manually. Typical reasons why things get hung up are FLAGs that remain in the system or some kind of miss entry in the coding during outprocessing from AD. These sometimes require some gymnastics to identify and solve.
If you aren't squared away by four months in, I would suggest submitting a pay inquiry and determine if there is a hang up of some sort.

If you have an admin section (place you get processed into the unit (paperwork)) I would go there. Usually they have someone that sits at a desk and you sign in with you issue, question, reasons for being there and they will direct you to the correct person.

Now keep in mind I'm a former Marine and all branches operate slightly different so I could be off a little, but your admin section which usually does the paperwork ... Should also be responsible for anything to do with pay so that's where I would start.

Another thing you could do is directly ask your readiness NCO if he/she knows and if not where they recommend checking. If they give you crap then go above them and let the next higher know what's going on. You can't get in any trouble because you are following your chain of command.

Those ate the steps I would take if needed to know.
Hope this helps

Usually your recruiting and retention NCOs handle that. That is where I would go to and see if they can help. They should have gave you a time line. Sometimes it is delayed on purpose until you are there for a certain period of time.

Question for your units Retention NCO. Different for each state