Good note, but I don't think this statement is correct. Since diffraction is an angular deflection, it is the aperture vs. projection-distance that counts, and therefore, it IS the f/stop that counts. See the graphs attached.
Not necessarily to be recommended but on a night school B&W printing course we students all tended to leave our early evening prints in the communal water bath for maybe an hour or more while we got on with other prints. Prints were eventually passed throught a heated roller RC dryer. I used Ilford RC paper. Never noticed any problems.