Thread: Constraints
View Single Post
Oh wait. Flip that all around, and I think you can do it.
1) Create a milestone.
2) Set its end constraint to 10 days into the project (in the Task: Information inspector)
3) Create a Finish->Start dependency (the default kind) from your task to this milestone.

This sounds kind of hackish to add a milestone here, but presumably if you care about something being finished by 10 days in, there's sort of a mental milestone there already.