Both page 10 of this July, 2003 Agfaphoto data sheet
Originally Posted by ADOX Fotoimpex
and page 2 of this A&O Rodinal data sheet
list 30 minutes at 20 degrees C for APX400 at 1+50.
I hope ADOX PAN 400 ends up requiring the same extended time. My reason is that ambient temperatures here in southern California, both air and "cold" water, are very high much of the year. It would be one of the few combinations available that permit reasonably long times when developing sheets with continuous agitation on a Jobo processor in Expert drums under such conditions.