I recently went through the approval process to contribute to a project on my own time. Due to its nature, the project obviously would not conflict with my business unit or any business unit within the company. Approval should have been a 5 minute conversation with my manager.
Instead, I had to write up a proposal for the open source review board. After a week or so, they agreed it was acceptable. The next step was to fill out a form and get a VP to manually sign it. This took a bit of time since the VP is 4 levels up and was, unsurprisingly, out of the country.
That experience will affect my next job search.