What are the Factors the director needs to consider when she chooses the best way to come up with plan?

The marketing director needs to submit a strategic plan for entering a new market. she knows she needs long periods of uninterrupted time .she considers two options (1) staying at home to do the plan or (2) delegating some parts of the plan to her subordinates. What are the Factors the director needs to consider when she chooses the best way to come up with plan?