I beleive it is on his site. 8 1/2 minutes from memory but better check it out as do not have my notes with me right now
His site is down right now.
“Photography is a complex and fluid medium, and its many factors are not applied in simple sequence. Rather, the process may be likened to the art of the juggler in keeping many balls in the air at one time!”
Ansel Adams, from the introduction to The Negative - The New Ansel Adams Photography Series / Book 2
That Covington site is great for hc110. I have used dilution h a few times and it has worked fine. But usually when I reach for hc110 I do so to use it at dilution b for its low base fog properties and fast developing times.
Last night I used dilution b in a 3 reel tank 870ml in total for 3 rolls, then using the same developer for the 3 roll tank to fill a 2 roll tank, and then again once more right after for another 2 roll tank. 7 rolls in total. 3 panatomic x for 5min at 75f, 2 Hie for 4:30, 2 tmax 400 for 6min. Everything came out well with good density except for a few shots on one roll of hie, I guess not enough ir light, and a few frames that were too dense when I shot a shaded scene without the ir filter. So all that with only using 27~30ml of concentrate.