What is the longest you have heard of someone lingering around in Basic training?

My uncle who was younger than I, was medically retired from the Marines. He spent 2 weeks in MCRD San Diego and 10 months in Balboa Naval hospital. He was retired as an E2. Hemmroids.

That is insane, what exactly was the reasoning for someone staying in quarters for so long? Maybe psych ward??

when 37Fs had "AIT" at SWC on FBNC, there would be "Hold Overs" for their Entire Initial Enlistment. Waiting on their Security Clearance to get completed, or waiting to in shape to attend (and Pass) Airborne school.

At Parris Island when people got dropped we never seen them again so no idea

Over two years

There were people in reception who had been there for months. Our DS had recycled BCT. Your girl stuck there for 2 years...that's crazy.

Not quite basic training, but I guess it qualifies as Initial Entry because she didn't have an MOS yet.
I was a SSG 11E40 (11E didn't have a 30 level back then). I was working as Supply Sergeant / Armorer at a Basic Training company. I was supposed to be "just filling in" until the 76Y arrived, but I don't think he ever did - he still wasn't there yet when I left 6 months later. But that's not the story here.

In their infinite wisdom, Bn decided to help us out by sending us a SP4 to work in the Supply Room. What makes this fit here is that the SP4 didn't have a 76Y MOS, in fact she didn't have any MOS at all. She had been in the Army a little over a year, had been promoted to SP4, and still didn't have an MOS. She was assigned to us for OJT to become a 76Y.

I never got the full story on how she had been in the Army for over a year without an MOS, but I did have the records from her previous assignment. She had just flunked out (twice) from 71L Administrative Specialist training at Fort Benjamin Harrison. Oh, by the way, she failed 71L training because she was never able to learn to type.

I pointed out that I couldn't be the trainer for 76Y OJT due to not being qualified as a 76Y myself. Battalion didn't care. "Just train her."

I looked up the Army program for 76Y OJT and immediately noticed that both typing and typing forms were among the requirements. Clearly someone who failed the same subject twice in a formal school could not be expected to just pick it up by "OJT" -- Bn didn't care -- "Just train her."

Three months later the company commander signed off on on the paperwork saying she was a qualified 76Y10 -- I never did sign it as the trainer. Part of the deal at that point was that once "qualified" she would be assigned elsewhere.

I hot hurt in basic and spent 3 months as a hold over

When I was in AIT there was one guy in my MOS who had been there long enough where he got promoted to SPC without a waiver. He had family problems and got injured so he kept getting pushed back on class and starting over and for some reason switched MOS to mine which was like 8 to 9 months long back than.

I didn't know there was such a thing. I mean I saw a few soldiers who knew way too much about BCT when I got to reception, so I assumed they were temporary holdovers. But I didn't know someone could be stuck in the system for a long time. The ones I usually saw were troops who couldn't pass the APFT and got sent to the Fitness Training Battery OR got chaptered out for failure to adapt. I started Basic at Sill in January and left Sill after AIT on the last day of May. Everyone I had seen that was a holdover or went to FTB was gone by the time I left.