Sonny:

I hope Guitarhacker is right as I'd like to see a clock in BIAB also.
In the meantime, rather than using a timer, I just open my BIAB file in RB and use the one that's there.

As you probably discovered, RB can have TWO open. One to show the Bar/Beat/Click and the "Big Clock" can show Hr/Min/Sec/ms (for example).

Good luck!
LLOYD S