My "formal practice" (which is what I considered this poll to represent) is the Two Stages of Secret Mantra, as well. This probably goes without saying.
I'd guess that for most of us practicing in Tibetan Vajrayana traditions, that would be the case. But it's possible that those practicing in the Tibetan traditions devote their formal sessions to "formal" Mahamudra or Dzokchen sessions, or Samatha/Vipassana, or whatnot.
I think a poll would be interesting, too...but we could likely guess what our Pure Land comrades, our Zen comrades, our Thera comrades would largely be doing with their formal practice time. Affiliation tells a great deal of the story.
So, perhaps a good question would be, what Tradition one follows?