Improve critical path

[Jan-Rienk]

I think duration would be a welcome addition anyway.

We’re not thinking in dates, we’re either thinking:

• “when is this due and how long does this take” to calculate when to start
  or the other way round:
• “when can we start and how long does this take” to calculate when it could be due

Related topics:

• Auto calculate due date with duration & dependencies
• The ability to use RULES to set a DUE DATE based on a numerical duration (CUSTOM FIELD) that adds to a changed START DATE