If you want to do real-life hours you probably want to use something like a web socket or a multiplayer server and have a login system, that will handle the time between logging in and logging out, then again you could code a custom plug-in for this which would probably be easier to do.
There's more than likely something we're overlooking you can do so much with construct 2 that there's probably a way to get the real time.
Just wanted to tell you what I would do to solve the issue. Good luck with your project I hope you get it to work!