It's the wrong paper to do it with, too many processing steps. Now the Harman Direct would be different, a monobath developer followed by a 2nd fixer bath and then a rinse and you could show an image within that time scale, then wash properly and dry with a print drier. Monobaths are quite tolerant of temperature changes and they work to completion so you wouldn't need highly accurate temperature control or timing, although the print would be fixed in the monobath a 2nd fixer gives long time stability/permanence with FB paper,
I should add that I worked on monobaths with papers for a potential commercial application in the 1970's and it was very successful. IT's something I'm considering for a project I have in mind at the moment.
Ian
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