There is a fundamental problem with planning innovation (doing something you or others did not do before):
Because you are doing something new, you cannot predict in front how much time you need as you don't know the problems you will encounter and the additional requirements/features that pop up during development (this always happens in software or system development).
PS. I am talking about real innovation. Most real innovations are build upon existing ones. So this holds only is you maximize sharing or re-use of existing systems, and not repeating your same trick over and over again. I will even go so far as saying: if you did a good planning your development is problably not very efficient.
