Hello Henning,
The development times for our table are listed directly below it (catalogue page 65).
You can also find some basic information on our website:
http://fotoimpex.de/Technik/Tip_Filmentwic...entwickeln.html
The term ‘Tetenal development time’ usually refers to the 3-second development cycle.
This means you tilt once every 3 seconds. In contrast, classic method a involves tilting every 15 seconds, and classic method b involves tilting continuously for the first 30 seconds and then for 10 seconds every minute.
Both classic methods should take roughly the same amount of time.
Best regards,
Mirko