Slow agitation every 3 secs (as shown on the label of Tetenal Ultrafin) ever...
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Ilford Pan F+ 50 at 25 in Kodak HC-110 1+49
4 minutes at 20°C/68.0°F
Kodak Tri-X 400 at 320 in Agfa Rodinal 1 to 100
2 hours (Stand developed) at 20°C/68.0°F
Ilford XP2 400 at 800 in Kodak HC-110 1+49
13 minutes, 30 seconds at 20°C/68.0°F
Ilford XP2 400 at 3200 in Kodak HC-110 1+49
24 minutes at 20°C/68.0°F