They *may* extend it for one hour, depending on how busy they are. If it were me, I'd have everything packed and just leave my bags with bell services. If you are flying that day, you can check them as early as you want that day. You'd just have to check your carry on's. I'm believe bell services has a cage or like for computers, etc. I always put a lock on carryon's when I fly anyhow.
When you return, just retrieve your bags and off you go!