When you have run several change projects, tackling your to-do list during the first 30 days is intuitive. You know what you have to do:
1) Reverse-engineer the project.
2) Map your stakeholders.
3) Come up with a customized communication strategy
4) Unearthing quick wins
5) Identifying roadblocks.
Why does it matter that you tackle these tasks during the first 30 days? As the Head of Transformation / Change, you instill structure and stability into the organizational system. That makes all others relax and helps you move in the right direction.