So I just started playing a Titan and upon activating my force barrier buff I've noticed there is no timer on it. The flame shield on my Warlock has a 15 second timer on it. This can't be intentional on Bungie's behalf, and regardless needs to be corrected. And while they're at it, I thing the Ward of Dawn also needs a timer on the bottom left corner.
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I think they didn't include a timer on Force Barrier because depending on what you're using, the time can be different. It's a little annoying, but you'll get the hang of it and just become aware of how long it lasts with your preferred loadout.