Its depends on a few things,honey :)
Its depends from the size of a piece of paper. This one big = A3
It depends on how much free time I have:) So I can paint such a drawing all day or 2-3 evenings
And, about my thoughts, I often sing when I paint :)
but in general,such drawings for me is something like meditation:) So I'm not sure what to answer you :)..
Although, perhaps I think about dreams, about love, about travels... :)
it sounds so atmospheric and cool, i can also try to paint something, and think about something inspiring)
^-^ i will glad to see you paintings ,honey :)!