Time for original FX-2 for FP4 roll film 68F is 14 min with 6 inversions/min.Agitation can be reduced to every 2 or 3 min with a time increase of 1/3 or 1/2.(BJP annual 1987)
Crawley never published any times for 400 ISO films in FX-2.
I develop Delta 100 21min 68F agitating every 3 min, EI 100 sun/shade.