[bux93]

This is why your project shouldn't be too small.

If a project is projected to be finished in 6 months, the current manager will still be there, and the success or failure will reflect on their record. It can only go wrong and reflect badly on them.

If a project will take 3 years, the manager can already collect their points for initiating a project with an incredible business case and innovative approach, leave after 18 months, and after a further six month, the new manager can say 'wow, my predecessor left a big mess, I'll clean it up/kill it'.