I use boredom as my cue.* Once I get bored with procrastination,
  then it's time to get it done. Much easier because I don't have
  that "unfinished" feeling. Sometimes other people are my cue.*
  Finished or not, they're expecting results, so then, I do it for
  them.* But if I'm doing it for myself?* Boredom is my only clue.
  Thanks :)* Yeah, sometimes when there's no timeline, sitting
  allows creativity to flourish.* That's why boredom helps.*
  Moment of boredom, then I'm like, "Ok, time to send out a
  product". Wait: I didn't tell the whole truth. I usually do
  things as a "speed challenge". that boosts productivity. But
  most projects I send out results incrementally.* A lot of my
  posts here are REALLY part of a long term project with an
  indefinite finish.