How many times a day should I water? Only recommendations I've seen in soil is once a day until 10% run off. Do I water twice a day 5%run off?
You probably have it sorted by now, but in soil with amendments (e.g., FFOF), you water when you pick up the pot and it is light. Have the same pot with dry soil in it and feel how little it weighs. Now pick up the pot that you just watered and see the large difference between fully saturated and fully dry.
Also, with amended soils, runoff pushes out the nutrition. It's not a big deal because you'll just have to re-amend or start using synthetics sooner, but it's something to keep in mind (unless you're already pushing synthetic bottled nutes into it, in which case you do want 10% runoff).