The general rule of thumb is to mix it thick enough that when you comb out the thin set onto the surface with the notch trowel the ridges left in the mud will not slump much if any. One must take care not to get to far out ahead of what can immediately be installed, when your mud is this thick it won't take long for the surface to skim over enough that it has lost it's sticky ness. Especially in warm weather or with air movement in the room.
Some applications can use a little wetter mud but never so wet that the ridges slump more than half their height of the notch .
When mixing mud on of the best ways to make it easier on yourself is to allow the fresh made bucket of mixed mud to set undisturbed for about 10 minutes or so. After this resting time has passed, remix it with your drill. This will deter the hardening time by more than half allowing you way more workable time with your mud. If you have not used up the bucket before it gets too stiff to work any longer you can add a small amount more water and hand mix with a margin trowel. I would advise doing this only one time. If the remixed mud gets to hard now, after hand mixing throw the remaining amount away and make a new batch as the mud is now too "tired" to do it's job correctly.
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