Film length

Over the weeks a lot of work has been put into the filming and ideas of the project to make it a decent length. We were told at the beginning of the year that the project should be at least 2-3 minutes and a maximum of 5-6. This week we were pleased to see that our film had come to a length of 4 minutes after editing until being told that the project must be a maximum length of 2 minutes. I find this very unfair as the projects made by previous years are all above 2 or 3 minutes. I don't want to cut the film down to 2 minutes as a lot of hard work will be lost and the film won't make much sense.