Tell Amitabh that 23 scenes in five hours is a world record, and he brushes off the compliment in his usual self-deprecating way.

'It's nothing. It is just work. And it's for a friend Apoorva Lakhia whom both Abhishek and I are very fond of,' Amitabh told IANS.

Lakhia is bowled over by his energy levels.

'In one word, we were speechless. In fact, the other cast members got tired. But Amitji just went on almost uninterrupted. I asked Arbaaz Khan to take a break. But watching Amitji he was totally enthused into pushing himself beyond his limit. That's the kind of impact Amitji has on the entire unit.

'When you see this 64-year-old wizard outdoing everyone's energy level you kind of pull up your socks and go for it,' said Lakhia.

Lakhia, who canned the shots on Tuesday, admitted he never ceases to be amazed by the actor.

'Each time, Amitji does something unimaginable we wonder how he'll break his own record next. This time he outdid himself. He was kind enough to give me four of his precious days to complete my entire work with him. We finished in just two days!'

'Besides his unmatchable zest for his work, there's another reason why Amitji is the quickest and most time-conscious actor in country. He knows every minute detail about camera angles, frame positioning and shot composition.

'When he goes in front of the camera, he's not just fully prepared, he's also mentally completed the shot even before it has started. Now do you know why he is who he is?