My sincere condolences on the loss. Leaving it out in artificial light will basically get it a small net gain in current charge level compared to what it is using, but will be essentially a stalemate, hours of exposure (if feet from light source) just to not lose charge, 4hrs office lighting yields a day of power.....to fully charge when dead under artificial light of incandescent bulb at 20" or fluorescent at 6", looking at 48hrs, while overhead light not much over break-even...Thanks for posting this. I inherited a Citizen Eco Driver from our daughter. Nice watch but to small for my wrist, and to fancy for my taste. After reading this thread I did take it out of my desk drawer. I will be selling it once I find a value on it.
From dead to full charge for outdoors/sunny day 7hrs, outdoors/overcast is 14hrs, and manual claims due to filtering/coatings on window glass to make it 28hrs in a sunny window....the only losses in MY cheap windows are from reflection and dust...none of those numbers fully reached unless facing light source entire time.