long shot

noun4

1. •
   A shot fired at a distant target.
2. •
   Something unlikely; something that has little chance of happening or working; long odds.

   • We can try your plan, but it's a long shot and it probably won't work.
3. •
   A master shot, the primary wide shot of a scene into which the closeups will be edited later.
4. •
   Synonym of long take; a single, continuous shot that lasts for an unusually long duration without any cuts.