The amount of time involved in a standardization process depends on a number of issues.
First, there is the type of standardization deliverable your project is pursuing: setting a formal standard for example will generally take considerably more time than concluding a workshop agreement. Even influencing an RFC can take a long time.
Second, having to start a standardization process from scratch, and having to go through all the consecutive steps in the process will take considerably more time than participating in a limited number of steps in an ongoing process.
Despite being an important indicator, the time involved in a standardization process is only one of the elements that will determine how many resources you will actually have to spend in order to archieve your standardization goals.