Just arrived at work and much to my surprise, the saber was still illuminated!?! Is this abnormal for a saber battery to last this long (14 hours)?
Depends on what batteries you have, and what type of 'sabre you have.
If you have extra strength Duracell (or whatever) and you're running a single-colour LED and no sound, 14 hours seems very possible.
If you have the usual li-ion batteries with sound and Emerald/multi-colour LED, then 14 hours would be very unusual, if not unheard of.