At an age of 79, Amitabh Bachchan is one of the busiest actors in Bollywood with projects like 'Kaun Banega Crorepati season 14' and his new films 'Brahmastra' and ' Goodbye'. Recently, in a promo of KBC season 14, the megastar says that he spends 12 to 14 hours on sets. Big B revealed that he starts working at 6 in the morning and works till 8-9 pm at night.