Workspace is now our first analytics tool and we have a lot of project for more than a year now.
Some of our project have been built with a fixed start date and a rolling end date (this is typical for a product launch for example of for a campaign that runs for a few weeks).
When you want to come back to such project 1 year later to make a new version of it or check the data for the full campaign, it barely loads and I guess it's just because of the super-long reporting window that doesn't make sense anymore.
An easy workaround would be to allow edition of project dates from Project Manager projects list without opening it
Another interesting option (maybe not as easy) would be to had a max-date as an option for a fixed-start/rolling-end reporting window project.
For example we could have another option next to "(none)" to specify that max-date is in this case "December 1st 2016" just to ensure I'm not pulling 13 months of data when I reopen my project a year later to build a new project for same campaign this year.