It's a Civil Registration record not a church record (see the top of the image), the words church records always comes up in the address I think because it links into the captcha which is held in the church records part of the site.
It is very sad if it turns out he was there for so long, but you have to bear in mind at that time there was a terrible stigma attached to any sort of metal illness and he had committed a crime so his family wouldn't have been allowed to help him. They may even have been told he was dead. He would have been better off going to prison at least then he had a chance of release at some point but it's highly likely once he was in the mental hospital he became institutionalized.
Sadly he is likely buried in Grangegorman, the graves are I believe unmarked.
I hope the records answer your questions and it turns out he only returned to the hospital later in life.
Hi
Just wondered if you might be interested in hearing how my enquiries panned out.
Through FOI, I applied for and have now received copies of various records from Richmond Asylum/Grangegorman concerning my Grt Uncle, Albert Chaplin.
Sadly, he did indeed remain in Grangegorman and other mental hospitals until his death in 1958. That's an incredible 46 years after his committal. Amongst the papers were details of his next of kin along with their addresses. There was a copy of a rather sweet note my grandfather had written to the Asylum in 1915 enquiring about the progress of his brother. I imagine he received a reply but there is no record of it.
Then almost 20 years later letters were sent to my grandad and my grandad's sister informing them that Albert was temporarily being moved to another hospital ( I suspect for an operation on a hernia - the writing is quite faint). Then there are copies of 3 envelopes that had been marked and returned as either 'Gone Away' or Not Known at this address'. These were sent to the addresses they'd held from 20 years earlier! Unsurprising.
I can only conclude from this that the family had ceased making enquiries about him, if they had then surely more up to date addresses would have been held on his medical record. I'm puzzled and troubled by this as it isn't a very nice thought to contemplate that the family had abandoned him.
There was no reference amongst the papers of burial/cremation details.
Whilst I'm pleased to have discovered as much as I have (and thanks once again to you for setting me on the right path) I'm saddened to think of this man's lonely plight.
Cheers, Spence