Diafine is usable over a wide temperature range with one developing time for all films. Fast, medium and slow films can be developed simultaneously without adjustment in developing time.
I wasn’t aware Diafine had these properties.
I often wait until I have two films to develop as I own two tanks so can “batch them up” so to speak.
But as I often shoot different films at different speeds I can’t put two rolls in one tank as the developer times differ.
Not so with Diafine it seems.
Diafine recipes on FilmDev.