A someone with two middle names "only" totaling 19 characters I still run into issues with many forms, both online and offline.

I'm never quite sure what to do on offline forms that have boxes for characters that run out, I normally just continue writing past the boxes, but at least one official government documentation has been addressed to me just missing the second one.

And a few things seem to handle having multiple middle names (and thus middle initials) poorly, ignoring the length.

I only have one middle name but it’s the one I’ve gone by my whole life. At some point trying to deal with forms got old and so I started just putting my middle and last names down and claiming no middle name. Most places that demand your full legal name don’t actually care enough to check, banks included. It’s never caused me problems.

In Hawaii, Mrs. Keihanaikukauakahihuliheekahaunaele can sympathize with you...

My name is often truncated

I know, the quotes must be there and will ignore anything inside, but with SQL misuse, you never know! Someone is probably using it in a worse way than any sane person would think possible.