First minute continuous agitation, then 5 seconds per minute.
Recipes & dev times using Film Ilford HP5+ 400
Ilford HP5+ 400 at 1600 in Kodak HC-110 1+31
13 minutes, 30 seconds at 20°C/68.0°F
Ilford HP5+ 400 in Kodak HC-110 1+31
7 minutes, 30 seconds at 20°C/68.0°F
Ilford HP5+ 400 in Kodak HC-110 1+7
5 minutes at 20°C/68.0°F