I've never tried it, but unless there is something I don't know about stopping it, you could split photos up into hours based on the timestamp inside the files.
In the Ingest dialog (CMD+G on macOS), you would want to copy photos into folder with name, and then in the folder name field, do something like /{hour24}
So in my workflow, I do date based folders. {yr4}/{mn0}-{mnn3}/{yr2}{mn0}{day0}
That automatically ingests photos into a 2019/01-Jan/YYMMDD/ folder structure. If you added /{hour24} to it, you would get a full 2019/01-Jan/YYMMDD/hr type structure.
I don't think you could organize photos by a "more than one hour since last photo" type of structure using PM.