Total project time frame that includes the time of linked processes in the overall view

I have created an overview of our Project Management from our Framework document and have created each stage in its own process and link them in the overall view. This give a simple view for executives to follow with links for staff to the process they must undertake. The issue is that the time does not come across from the link processes to the overall view. It would be very helpful if it did so you can see the whole timeline for the process.

My work around for this was to create a new role called Time Frame and enter the timeline from the linked processes in there so it is visible in the overall view.

Thanks to support for nutting this out with me (Tanzim)