Thanks! Well, that's good news that it lasts. My guess as to my longer times is that it was colder in the room (the first two times I did it were during the summer). I don't have a heating pad (maybe the infamous piglet warming pad should be on my shopping list), so that may be part of the issue. The darkroom is on the house system, but it's still colder than upstairs. The last time I used lith, I put the lith developing tray in a larger tray with warm water. The interesting thing to me was that the outer areas were lighter than the middles. I would have expected the opposite. But who knows with lith and I'm open to whatever happens. And I've only done lith about four times so far, so I'm still on the steep side of the learning curve.