Day 0 - as the CDO, you are now the new corporate punch bag.
In commercial land, the axis of power has tended to rest with the CEO/ CFO relationship. There is always a myriad of other political triangles that lobby and wrestle for power and sway decisions. Given that decisions are increasingly reliant on evidence which is data, the CDO gets dragged into everyone's battles, which are not always in the best interest of the business, customer, ecosystem or society - such are incentive scheme. Everyone else in the senior team does not want to recognise is that the data they use as evidence and proof is equally supportive or detrimental to everyone else's cause. Whilst everyone else on the leadership team gets to pick and bias what they foreground and promote, the CDO has to keep their mind open and judge all data with the same level of critical thinking. This tends to mean the CDO becomes the punch bag when data either supports or otherwise a decision, which in reality is a political lobby for power which the data may not fully support