Project grid ends

At the risk of sounding stupid, how do I enlarge the project grid? I have been working on quite a large project and I have noticed that I cannot scroll forward past 14:29 minutes - 236 bars. It looks as if I have come to the end of the grid. Is it some kind of a setting, glitch or some kind of a stupid error on my part?

Project > Project Setup, you can set the Start and End times of a Project.
I believe this will address your issue.