The time it takes dépends on your skill and your Equipment. Also if you are doing this for free, you should definatelly ask him to help you!
So the Sonata is Hyundai's 3rd smallest car (Rio is smallest, then Elantra, then Sonata). It`s an average size sedan I would say.
So let's look at time it would take me for each step with my skill and Equipment, if you are an amateur, add 20-50% more time I would say.
Cleanining the exterior with 2 bucket method using a pre-wash with foam gun and power rinse, doing good job cleaning wheels when they have pretty much never been done before... 90 to 120 minutes.
Claying the car about 60 minutes. If you are using a clay alternative like a Nano Sponge cut the time in half.
Polishing about 3 hours for me. When I don't compound first, I usually do 5 passes. If you go faster and do 2 or 3 passes you would probably shave an hour off that.
IPA wipedown. About 10 minutes.
Applying a sealant like 845 about 20 minutes to put it on. 10 minutes to buff it off after it cured.
Interior vaccuum time really depend on the result you want. Quick vaccum would take about 15 minutes. If it's really dirty and you have to work hard at it, it has taken me an hour in the past on some cars.
Interior cleaning (no shampoo) usually takes me an hour (that's just wiping down everything)
Interior Windows about 30 minutes if they have not been cleaned for a while. That's 2 cleaning per window and a 3rd step for the windshield (I use magic eracer to break down the window film before cleaning).
Interior protectant, depending how meticulous you wanna be, about an hour.
So as you can see, it's quite the workload. If your friend helps you, cut out about 30% to 50% of the total time it would take you to do it alone.
If he is not knowledgable about detailing, you can have him do the easy things like cleaning your pads while polishing, doing the IPA wipedown when you are done polishing a panel, vaccuming while you are polishing, etc.
Hope you and your friend enjoy yourselves
I have a very good friend who got a sedan for a method of transport. Hyundai sonata I think (not familiar with Hyundai). It gets little care but it is not totally hammered. I will probably go with a foam soak with a gun, two bucket wash with grit guards and mitt/maxi suds, rinse and then clay with onr or car soap.
Polishing will probably be needed but lightly. Want to try out HD adapt on a red meguiars microfiber pad.
Eventually I might want to ipa wipe down but dont know how to do this in terms of ipa strength.
Probably will put meguiars paint protect on then collinite 476s.
Interior should just need a vaccum and light cleaning and 303 protectant.
I dont know how long this should take and payment from the friend would be zero so no wage is really needed. Just how much time should a full detail take roughly?